21237473212 has 24 divisors (see below), whose sum is σ = 39509018640. Its totient is φ = 9960249600.

The previous prime is 21237473189. The next prime is 21237473221.

21237473212 is nontrivially palindromic in base 10.

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, 1375693 + ... + 1391044.

It is an arithmetic number, because the mean of its divisors is an integer number (1646209110).

Almost surely, 2^21237473212 is an apocalyptic number.

It is an amenable number.

21237473212 is a deficient number, since it is larger than the sum of its proper divisors (18271545428).

21237473212 is a wasteful number, since it uses less digits than its factorization.

21237473212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766861 (or 2766859 counting only the distinct ones).

The product of its digits is 28224, while the sum is 34.

The spelling of 21237473212 in words is "twenty-one billion, two hundred thirty-seven million, four hundred seventy-three thousand, two hundred twelve".