21022222101220 has 48 divisors (see below), whose sum is σ = 45225743698800. Its totient is φ = 8203371438080.

The previous prime is 21022222101217. The next prime is 21022222101233. The reversal of 21022222101220 is 2210122222012.

It can be written as a sum of positive squares in 8 ways, for example, as 59156941284 + 20963065159936 = 243222^2 + 4578544^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15510996 + ... + 16811764.

It is an arithmetic number, because the mean of its divisors is an integer number (942202993725).

Almost surely, 2^{21022222101220} is an apocalyptic number.

21022222101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022222101220 is an abundant number, since it is smaller than the sum of its proper divisors (24203521597580).

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

21022222101220 is a wasteful number, since it uses less digits than its factorization.

21022222101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320528 (or 1320526 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21022222101220 its reverse (2210122222012), we get a palindrome (23232344323232).

The spelling of 21022222101220 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty".