21237680613 has 8 divisors (see below), whose sum is σ = 28321384576. Its totient is φ = 14156215200.

The previous prime is 21237680599. The next prime is 21237680623. The reversal of 21237680613 is 31608673212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21237680613 - 2¹⁸ = 21237418469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237680623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537373 + ... + 575538.

It is an arithmetic number, because the mean of its divisors is an integer number (3540173072).

Almost surely, 2^21237680613 is an apocalyptic number.

It is an amenable number.

21237680613 is a deficient number, since it is larger than the sum of its proper divisors (7083703963).

21237680613 is a wasteful number, since it uses less digits than its factorization.

21237680613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119275.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 21237680613 in words is "twenty-one billion, two hundred thirty-seven million, six hundred eighty thousand, six hundred thirteen".