21631500261349 has 8 divisors (see below), whose sum is σ = 24624000297792. Its totient is φ = 18810000227040.

The previous prime is 21631500261337. The next prime is 21631500261353. The reversal of 21631500261349 is 94316200513612.

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

It is not a de Polignac number, because 21631500261349 - 2²¹ = 21631498164197 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 (21631500061349) 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, 42750000264 + ... + 42750000769.

It is an arithmetic number, because the mean of its divisors is an integer number (3078000037224).

Almost surely, 2^{21631500261349} is an apocalyptic number.

It is an amenable number.

21631500261349 is a deficient number, since it is larger than the sum of its proper divisors (2992500036443).

21631500261349 is a wasteful number, since it uses less digits than its factorization.

21631500261349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85500001067.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 21631500261349 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred million, two hundred sixty-one thousand, three hundred forty-nine".