21604031131 has 8 divisors (see below), whose sum is σ = 21812217840. Its totient is φ = 21395960928.

The previous prime is 21604031117. The next prime is 21604031143. The reversal of 21604031131 is 13113040612.

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

It is a cyclic number.

It is not a de Polignac number, because 21604031131 - 2⁹ = 21604030619 is a prime.

It is a super-2 number, since 2×21604031131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21604031191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369645 + ... + 424081.

It is an arithmetic number, because the mean of its divisors is an integer number (2726527230).

Almost surely, 2^21604031131 is an apocalyptic number.

21604031131 is a deficient number, since it is larger than the sum of its proper divisors (208186709).

21604031131 is a wasteful number, since it uses less digits than its factorization.

21604031131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58253.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21604031131 its reverse (13113040612), we get a palindrome (34717071743).

The spelling of 21604031131 in words is "twenty-one billion, six hundred four million, thirty-one thousand, one hundred thirty-one".