21737538107 has 12 divisors (see below), whose sum is σ = 23178384936. Its totient is φ = 20381120640.

The previous prime is 21737538001. The next prime is 21737538127. The reversal of 21737538107 is 70183573712.

It is not a de Polignac number, because 21737538107 - 2²² = 21733343803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21737538127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275369 + ... + 345402.

It is an arithmetic number, because the mean of its divisors is an integer number (1931532078).

Almost surely, 2^21737538107 is an apocalyptic number.

21737538107 is a deficient number, since it is larger than the sum of its proper divisors (1440846829).

21737538107 is an equidigital number, since it uses as much as digits as its factorization.

21737538107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620906 (or 620887 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 21737538107 in words is "twenty-one billion, seven hundred thirty-seven million, five hundred thirty-eight thousand, one hundred seven".