21012992153 has 4 divisors (see below), whose sum is σ = 21026611968. Its totient is φ = 20999372340.

The previous prime is 21012992149. The next prime is 21012992177. The reversal of 21012992153 is 35129921012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012992153 - 2² = 21012992149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012992053) 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, 6807593 + ... + 6810678.

It is an arithmetic number, because the mean of its divisors is an integer number (5256652992).

Almost surely, 2^21012992153 is an apocalyptic number.

It is an amenable number.

21012992153 is a deficient number, since it is larger than the sum of its proper divisors (13619815).

21012992153 is a wasteful number, since it uses less digits than its factorization.

21012992153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13619814.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 21012992153 in words is "twenty-one billion, twelve million, nine hundred ninety-two thousand, one hundred fifty-three".