21122032220 has 48 divisors (see below), whose sum is σ = 44703912960. Its totient is φ = 8382808896.

The previous prime is 21122032213. The next prime is 21122032223. The reversal of 21122032220 is 2223022112.

It is a super-2 number, since 2×21122032220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122032223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1651169 + ... + 1663911.

It is an arithmetic number, because the mean of its divisors is an integer number (931331520).

Almost surely, 2^21122032220 is an apocalyptic number.

21122032220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122032220 is an abundant number, since it is smaller than the sum of its proper divisors (23581880740).

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

21122032220 is a wasteful number, since it uses less digits than its factorization.

21122032220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13394 (or 13392 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21122032220 its reverse (2223022112), we get a palindrome (23345054332).

The spelling of 21122032220 in words is "twenty-one billion, one hundred twenty-two million, thirty-two thousand, two hundred twenty".