21395304519831 has 36 divisors (see below), whose sum is σ = 35446143545904. Its totient is φ = 12403075069440.

The previous prime is 21395304519773. The next prime is 21395304519839. The reversal of 21395304519831 is 13891540359312.

It is a happy number.

21395304519831 is a `hidden beast` number, since 2 + 1 + 3 + 95 + 3 + 0 + 4 + 519 + 8 + 31 = 666.

It is not a de Polignac number, because 21395304519831 - 2²¹ = 21395302422679 is a prime.

It is a super-2 number, since 2×21395304519831² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395304519839) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 427078090 + ... + 427128183.

Almost surely, 2^{21395304519831} is an apocalyptic number.

21395304519831 is a deficient number, since it is larger than the sum of its proper divisors (14050839026073).

21395304519831 is a wasteful number, since it uses less digits than its factorization.

21395304519831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854206324 (or 854206310 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 21395304519831 in words is "twenty-one trillion, three hundred ninety-five billion, three hundred four million, five hundred nineteen thousand, eight hundred thirty-one".