21021022022 has 64 divisors (see below), whose sum is σ = 42391641600. Its totient is φ = 7550081280.

The previous prime is 21021021979. The next prime is 21021022049. The reversal of 21021022022 is 22022012012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21021021988 and 21021022006.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1613129 + ... + 1626107.

It is an arithmetic number, because the mean of its divisors is an integer number (662369400).

Almost surely, 2^21021022022 is an apocalyptic number.

21021022022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021022022 is an abundant number, since it is smaller than the sum of its proper divisors (21370619578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021022022 is a wasteful number, since it uses less digits than its factorization.

21021022022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13821.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21021022022 its reverse (22022012012), we get a palindrome (43043034034).

It can be divided in two parts, 210210 and 22022, that added together give a palindrome (232232).

The spelling of 21021022022 in words is "twenty-one billion, twenty-one million, twenty-two thousand, twenty-two".