121012001221 has 4 divisors (see below), whose sum is σ = 128130354252. Its totient is φ = 113893648192.

The previous prime is 121012001213. The next prime is 121012001237. The reversal of 121012001221 is 122100210121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122100210121 = 19333 ⋅6315637.

It can be written as a sum of positive squares in 2 ways, for example, as 50845289121 + 70166712100 = 225489^2 + 264890^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012001221 - 2³ = 121012001213 is a prime.

It is a super-2 number, since 2×121012001221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559176490 + ... + 3559176523.

It is an arithmetic number, because the mean of its divisors is an integer number (32032588563).

Almost surely, 2^121012001221 is an apocalyptic number.

It is an amenable number.

121012001221 is a deficient number, since it is larger than the sum of its proper divisors (7118353031).

121012001221 is an equidigital number, since it uses as much as digits as its factorization.

121012001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7118353030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121012001221 its reverse (122100210121), we get a palindrome (243112211342).

The spelling of 121012001221 in words is "one hundred twenty-one billion, twelve million, one thousand, two hundred twenty-one".