21211033031 has 16 divisors (see below), whose sum is σ = 22195891200. Its totient is φ = 20251060128.

The previous prime is 21211033007. The next prime is 21211033049. The reversal of 21211033031 is 13033011212.

It is a cyclic number.

It is not a de Polignac number, because 21211033031 - 2²⁶ = 21143924167 is a prime.

It is a super-2 number, since 2×21211033031² (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 (21211033531) 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, 454190 + ... + 498708.

It is an arithmetic number, because the mean of its divisors is an integer number (1387243200).

Almost surely, 2^21211033031 is an apocalyptic number.

21211033031 is a deficient number, since it is larger than the sum of its proper divisors (984858169).

21211033031 is a wasteful number, since it uses less digits than its factorization.

21211033031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44798.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21211033031 its reverse (13033011212), we get a palindrome (34244044243).

The spelling of 21211033031 in words is "twenty-one billion, two hundred eleven million, thirty-three thousand, thirty-one".