21537473512 has 64 divisors (see below), whose sum is σ = 41948928000. Its totient is φ = 10359360000.

The previous prime is 21537473491. The next prime is 21537473611.

It is a happy number.

21537473512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21537473512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8976489 + ... + 8978887.

It is an arithmetic number, because the mean of its divisors is an integer number (655452000).

Almost surely, 2^21537473512 is an apocalyptic number.

It is an amenable number.

21537473512 is a deficient number, since it is larger than the sum of its proper divisors (20411454488).

21537473512 is a wasteful number, since it uses less digits than its factorization.

21537473512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818 (or 2814 counting only the distinct ones).

The product of its digits is 176400, while the sum is 40.

The spelling of 21537473512 in words is "twenty-one billion, five hundred thirty-seven million, four hundred seventy-three thousand, five hundred twelve".