21022231031 has 16 divisors (see below), whose sum is σ = 21443284800. Its totient is φ = 20605052160.

The previous prime is 21022230997. The next prime is 21022231033. The reversal of 21022231031 is 13013222012.

It is a cyclic number.

It is not a de Polignac number, because 21022231031 - 2⁶ = 21022230967 is a prime.

It is a super-2 number, since 2×21022231031² (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 (21022231033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9836195 + ... + 9838331.

It is an arithmetic number, because the mean of its divisors is an integer number (1340205300).

Almost surely, 2^21022231031 is an apocalyptic number.

21022231031 is a deficient number, since it is larger than the sum of its proper divisors (421053769).

21022231031 is a wasteful number, since it uses less digits than its factorization.

21022231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21022231031 its reverse (13013222012), we get a palindrome (34035453043).

The spelling of 21022231031 in words is "twenty-one billion, twenty-two million, two hundred thirty-one thousand, thirty-one".