15657002121 has 16 divisors (see below), whose sum is σ = 21147910784. Its totient is φ = 10302626304.

The previous prime is 15657002111. The next prime is 15657002143. The reversal of 15657002121 is 12120075651.

15657002121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15657002121 - 2⁷ = 15657001993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15657002111) 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 15 ways as a sum of consecutive naturals, for example, 36420 + ... + 180666.

It is an arithmetic number, because the mean of its divisors is an integer number (1321744424).

Almost surely, 2^15657002121 is an apocalyptic number.

It is an amenable number.

15657002121 is a deficient number, since it is larger than the sum of its proper divisors (5490908663).

15657002121 is a wasteful number, since it uses less digits than its factorization.

15657002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144720.

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 15657002121 its reverse (12120075651), we get a palindrome (27777077772).

The spelling of 15657002121 in words is "fifteen billion, six hundred fifty-seven million, two thousand, one hundred twenty-one".