121011000021221 has 4 divisors (see below), whose sum is σ = 122258536104012. Its totient is φ = 119763463938432.

The previous prime is 121011000021203. The next prime is 121011000021239. The reversal of 121011000021221 is 122120000110121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (121011000021203) and next prime (121011000021239).

It can be written as a sum of positive squares in 2 ways, for example, as 46419898636225 + 74591101384996 = 6813215^2 + 8636614^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011000021221 - 2⁶ = 121011000021157 is a prime.

It is a super-2 number, since 2×121011000021221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121011000021196 and 121011000021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011000021251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623768041250 + ... + 623768041443.

It is an arithmetic number, because the mean of its divisors is an integer number (30564634026003).

Almost surely, 2^{121011000021221} is an apocalyptic number.

It is an amenable number.

121011000021221 is a deficient number, since it is larger than the sum of its proper divisors (1247536082791).

121011000021221 is an equidigital number, since it uses as much as digits as its factorization.

121011000021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247536082790.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121011000021221 its reverse (122120000110121), we get a palindrome (243131000131342).

The spelling of 121011000021221 in words is "one hundred twenty-one trillion, eleven billion, twenty-one thousand, two hundred twenty-one".