21313504605 has 64 divisors (see below), whose sum is σ = 37413508608. Its totient is φ = 10316759040.

The previous prime is 21313504601. The next prime is 21313504607. The reversal of 21313504605 is 50640531312.

It is not a de Polignac number, because 21313504605 - 2² = 21313504601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313504601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1056160 + ... + 1076150.

It is an arithmetic number, because the mean of its divisors is an integer number (584586072).

Almost surely, 2^21313504605 is an apocalyptic number.

It is an amenable number.

21313504605 is a deficient number, since it is larger than the sum of its proper divisors (16100004003).

21313504605 is a wasteful number, since it uses less digits than its factorization.

21313504605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20166.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 21313504605 in words is "twenty-one billion, three hundred thirteen million, five hundred four thousand, six hundred five".