21122313020 has 12 divisors (see below), whose sum is σ = 44356857384. Its totient is φ = 8448925200.

The previous prime is 21122313019. The next prime is 21122313031. The reversal of 21122313020 is 2031322112.

It is a self number, because there is not a number n which added to its sum of digits gives 21122313020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528057806 + ... + 528057845.

It is an arithmetic number, because the mean of its divisors is an integer number (3696404782).

Almost surely, 2^21122313020 is an apocalyptic number.

21122313020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122313020 is an abundant number, since it is smaller than the sum of its proper divisors (23234544364).

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

21122313020 is a wasteful number, since it uses less digits than its factorization.

21122313020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056115660 (or 1056115658 counting only the distinct ones).

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

Adding to 21122313020 its reverse (2031322112), we get a palindrome (23153635132).

It can be divided in two parts, 2112 and 2313020, that added together give a palindrome (2315132).

The spelling of 21122313020 in words is "twenty-one billion, one hundred twenty-two million, three hundred thirteen thousand, twenty".