21209883031 has 8 divisors (see below), whose sum is σ = 21487675904. Its totient is φ = 20933821440.

The previous prime is 21209883011. The next prime is 21209883041. The reversal of 21209883031 is 13038890212.

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 21209883031 - 2²³ = 21201494423 is a prime.

It is a super-2 number, since 2×21209883031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21209883001) 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, 408150 + ... + 457171.

It is an arithmetic number, because the mean of its divisors is an integer number (2685959488).

Almost surely, 2^21209883031 is an apocalyptic number.

21209883031 is a deficient number, since it is larger than the sum of its proper divisors (277792873).

21209883031 is a wasteful number, since it uses less digits than its factorization.

21209883031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865641.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 21209883031 in words is "twenty-one billion, two hundred nine million, eight hundred eighty-three thousand, thirty-one".