21022331020 has 24 divisors (see below), whose sum is σ = 44154142704. Its totient is φ = 8407551936.

The previous prime is 21022331009. The next prime is 21022331023. The reversal of 21022331020 is 2013322012.

It is a junction number, because it is equal to n+sod(n) for n = 21022330985 and 21022331003.

It is not an unprimeable number, because it can be changed into a prime (21022331023) 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, 43342 + ... + 209578.

It is an arithmetic number, because the mean of its divisors is an integer number (1839755946).

Almost surely, 2^21022331020 is an apocalyptic number.

21022331020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022331020 is an abundant number, since it is smaller than the sum of its proper divisors (23131811684).

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

21022331020 is a wasteful number, since it uses less digits than its factorization.

21022331020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172569 (or 172567 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21022331020 its reverse (2013322012), we get a palindrome (23035653032).

The spelling of 21022331020 in words is "twenty-one billion, twenty-two million, three hundred thirty-one thousand, twenty".