121552261021 has 8 divisors (see below), whose sum is σ = 122818149944. Its totient is φ = 120286632960.

The previous prime is 121552261003. The next prime is 121552261031. The reversal of 121552261021 is 120162255121.

It can be written as a sum of positive squares in 4 ways, for example, as 75751552900 + 45800708121 = 275230^2 + 214011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121552261021 - 2⁵ = 121552260989 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 (121552261001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954001 + ... + 1073881.

It is an arithmetic number, because the mean of its divisors is an integer number (15352268743).

Almost surely, 2^121552261021 is an apocalyptic number.

It is an amenable number.

121552261021 is a deficient number, since it is larger than the sum of its proper divisors (1265888923).

121552261021 is a wasteful number, since it uses less digits than its factorization.

121552261021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130431.

The product of its (nonzero) digits is 2400, while the sum is 28.

The spelling of 121552261021 in words is "one hundred twenty-one billion, five hundred fifty-two million, two hundred sixty-one thousand, twenty-one".