21457570156 has 12 divisors (see below), whose sum is σ = 40964452200. Its totient is φ = 9753440960.

The previous prime is 21457570133. The next prime is 21457570217. The reversal of 21457570156 is 65107575412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243835981 + ... + 243836068.

It is an arithmetic number, because the mean of its divisors is an integer number (3413704350).

Almost surely, 2^21457570156 is an apocalyptic number.

It is an amenable number.

21457570156 is a deficient number, since it is larger than the sum of its proper divisors (19506882044).

21457570156 is a wasteful number, since it uses less digits than its factorization.

21457570156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487672064 (or 487672062 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 21457570156 in words is "twenty-one billion, four hundred fifty-seven million, five hundred seventy thousand, one hundred fifty-six".