15721022051 has 16 divisors (see below), whose sum is σ = 19061650944. Its totient is φ = 12657243264.

The previous prime is 15721021993. The next prime is 15721022063. The reversal of 15721022051 is 15022012751.

It is a cyclic number.

It is not a de Polignac number, because 15721022051 - 2¹⁰ = 15721021027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15721022051.

It is not an unprimeable number, because it can be changed into a prime (15721022071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71465 + ... + 191178.

It is an arithmetic number, because the mean of its divisors is an integer number (1191353184).

Almost surely, 2^15721022051 is an apocalyptic number.

15721022051 is a deficient number, since it is larger than the sum of its proper divisors (3340628893).

15721022051 is a wasteful number, since it uses less digits than its factorization.

15721022051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263170.

The product of its (nonzero) digits is 1400, while the sum is 26.

The spelling of 15721022051 in words is "fifteen billion, seven hundred twenty-one million, twenty-two thousand, fifty-one".