21437537105 has 8 divisors (see below), whose sum is σ = 26554884864. Its totient is φ = 16596802800.

The previous prime is 21437537059. The next prime is 21437537131. The reversal of 21437537105 is 50173573412.

It is a happy number.

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

It is not a de Polignac number, because 21437537105 - 2²⁴ = 21420759889 is a prime.

It is a Duffinian 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, 69153191 + ... + 69153500.

It is an arithmetic number, because the mean of its divisors is an integer number (3319360608).

Almost surely, 2^21437537105 is an apocalyptic number.

It is an amenable number.

21437537105 is a deficient number, since it is larger than the sum of its proper divisors (5117347759).

21437537105 is a wasteful number, since it uses less digits than its factorization.

21437537105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138306727.

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 21437537105 in words is "twenty-one billion, four hundred thirty-seven million, five hundred thirty-seven thousand, one hundred five".