21157610224 has 20 divisors (see below), whose sum is σ = 41264350480. Its totient is φ = 10508745600.

The previous prime is 21157610171. The next prime is 21157610249. The reversal of 21157610224 is 42201675112.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4376229 + ... + 4381060.

It is an arithmetic number, because the mean of its divisors is an integer number (2063217524).

Almost surely, 2^21157610224 is an apocalyptic number.

It is an amenable number.

21157610224 is a deficient number, since it is larger than the sum of its proper divisors (20106740256).

21157610224 is a wasteful number, since it uses less digits than its factorization.

21157610224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8757448 (or 8757442 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 21157610224 in words is "twenty-one billion, one hundred fifty-seven million, six hundred ten thousand, two hundred twenty-four".