21888856857051 has 8 divisors (see below), whose sum is σ = 32427936084560. Its totient is φ = 14592571238016.

The previous prime is 21888856857031. The next prime is 21888856857113. The reversal of 21888856857051 is 15075865888812.

21888856857051 is a `hidden beast` number, since 2 + 1 + 8 + 8 + 8 + 8 + 568 + 5 + 7 + 0 + 51 = 666.

It is not a de Polignac number, because 21888856857051 - 2⁵ = 21888856857019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21888856857031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405349201030 + ... + 405349201083.

It is an arithmetic number, because the mean of its divisors is an integer number (4053492010570).

Almost surely, 2^{21888856857051} is an apocalyptic number.

21888856857051 is a deficient number, since it is larger than the sum of its proper divisors (10539079227509).

21888856857051 is an equidigital number, since it uses as much as digits as its factorization.

21888856857051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810698402122 (or 810698402116 counting only the distinct ones).

The product of its (nonzero) digits is 344064000, while the sum is 72.

The spelling of 21888856857051 in words is "twenty-one trillion, eight hundred eighty-eight billion, eight hundred fifty-six million, eight hundred fifty-seven thousand, fifty-one".