21022211031 has 4 divisors (see below), whose sum is σ = 28029614712. Its totient is φ = 14014807352.

The previous prime is 21022211017. The next prime is 21022211051. The reversal of 21022211031 is 13011222012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21022211031 - 2⁶ = 21022210967 is a prime.

It is a super-2 number, since 2×21022211031² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21022211031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022211011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503701836 + ... + 3503701841.

It is an arithmetic number, because the mean of its divisors is an integer number (7007403678).

Almost surely, 2^21022211031 is an apocalyptic number.

21022211031 is a deficient number, since it is larger than the sum of its proper divisors (7007403681).

21022211031 is an equidigital number, since it uses as much as digits as its factorization.

21022211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007403680.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21022211031 its reverse (13011222012), we get a palindrome (34033433043).

The spelling of 21022211031 in words is "twenty-one billion, twenty-two million, two hundred eleven thousand, thirty-one".