21647504156 has 24 divisors (see below), whose sum is σ = 39885251280. Its totient is φ = 10251954432.

The previous prime is 21647504093. The next prime is 21647504171. The reversal of 21647504156 is 65140574612.

It is a super-2 number, since 2×21647504156² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375686 + ... + 429458.

It is an arithmetic number, because the mean of its divisors is an integer number (1661885470).

Almost surely, 2^21647504156 is an apocalyptic number.

It is an amenable number.

21647504156 is a deficient number, since it is larger than the sum of its proper divisors (18237747124).

21647504156 is a wasteful number, since it uses less digits than its factorization.

21647504156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59093 (or 59091 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 21647504156 in words is "twenty-one billion, six hundred forty-seven million, five hundred four thousand, one hundred fifty-six".