21237497144 has 16 divisors (see below), whose sum is σ = 39824723520. Its totient is φ = 10617570880.

The previous prime is 21237497137. The next prime is 21237497153. The reversal of 21237497144 is 44179473212.

It is a junction number, because it is equal to n+sod(n) for n = 21237497095 and 21237497104.

It is a congruent number.

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, 68069 + ... + 217044.

It is an arithmetic number, because the mean of its divisors is an integer number (2489045220).

Almost surely, 2^21237497144 is an apocalyptic number.

It is an amenable number.

21237497144 is a deficient number, since it is larger than the sum of its proper divisors (18587226376).

21237497144 is a wasteful number, since it uses less digits than its factorization.

21237497144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294430 (or 294426 counting only the distinct ones).

The product of its digits is 338688, while the sum is 44.

The spelling of 21237497144 in words is "twenty-one billion, two hundred thirty-seven million, four hundred ninety-seven thousand, one hundred forty-four".