21347564726 has 16 divisors (see below), whose sum is σ = 32325976800. Its totient is φ = 10572363648.

The previous prime is 21347564663. The next prime is 21347564731. The reversal of 21347564726 is 62746574312.

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, 322040 + ... + 382628.

It is an arithmetic number, because the mean of its divisors is an integer number (2020373550).

Almost surely, 2^21347564726 is an apocalyptic number.

21347564726 is a deficient number, since it is larger than the sum of its proper divisors (10978412074).

21347564726 is a wasteful number, since it uses less digits than its factorization.

21347564726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62263.

The product of its digits is 1693440, while the sum is 47.

The spelling of 21347564726 in words is "twenty-one billion, three hundred forty-seven million, five hundred sixty-four thousand, seven hundred twenty-six".