121001122121221 has 4 divisors (see below), whose sum is σ = 121471943608332. Its totient is φ = 120530300634112.

The previous prime is 121001122121197. The next prime is 121001122121261. The reversal of 121001122121221 is 122121221100121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94702286880100 + 26298835241121 = 9731510^2 + 5128239^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001122121221 - 2¹³ = 121001122113029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001122121261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235410743170 + ... + 235410743683.

It is an arithmetic number, because the mean of its divisors is an integer number (30367985902083).

Almost surely, 2^{121001122121221} is an apocalyptic number.

It is an amenable number.

121001122121221 is a deficient number, since it is larger than the sum of its proper divisors (470821487111).

121001122121221 is an equidigital number, since it uses as much as digits as its factorization.

121001122121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470821487110.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121001122121221 its reverse (122121221100121), we get a palindrome (243122343221342).

The spelling of 121001122121221 in words is "one hundred twenty-one trillion, one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".