21094563831 has 32 divisors (see below), whose sum is σ = 31742785536. Its totient is φ = 12344832000.

The previous prime is 21094563823. The next prime is 21094563851. The reversal of 21094563831 is 13836549012.

It is not a de Polignac number, because 21094563831 - 2³ = 21094563823 is a prime.

It is a super-2 number, since 2×21094563831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21094563851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 444951 + ... + 490071.

It is an arithmetic number, because the mean of its divisors is an integer number (991962048).

Almost surely, 2^21094563831 is an apocalyptic number.

21094563831 is a deficient number, since it is larger than the sum of its proper divisors (10648221705).

21094563831 is a wasteful number, since it uses less digits than its factorization.

21094563831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45623.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 21094563831 in words is "twenty-one billion, ninety-four million, five hundred sixty-three thousand, eight hundred thirty-one".