21002031319 has 16 divisors (see below), whose sum is σ = 22778208288. Its totient is φ = 19286894592.

The previous prime is 21002031317. The next prime is 21002031359. The reversal of 21002031319 is 91313020012.

It is a cyclic number.

It is not a de Polignac number, because 21002031319 - 2¹ = 21002031317 is a prime.

It is a super-2 number, since 2×21002031319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002031319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002031313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714399 + ... + 743215.

It is an arithmetic number, because the mean of its divisors is an integer number (1423638018).

Almost surely, 2^21002031319 is an apocalyptic number.

21002031319 is a deficient number, since it is larger than the sum of its proper divisors (1776176969).

21002031319 is a wasteful number, since it uses less digits than its factorization.

21002031319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29874.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21002031319 in words is "twenty-one billion, two million, thirty-one thousand, three hundred nineteen".