21121202022220 has 48 divisors (see below), whose sum is σ = 44439448919040. Its totient is φ = 8432312117184.

The previous prime is 21121202022197. The next prime is 21121202022241. The reversal of 21121202022220 is 2222020212112.

It is a super-2 number, since 2×21121202022220² (a number of 27 digits) contains 22 as substring.

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, 45646867 + ... + 46107253.

It is an arithmetic number, because the mean of its divisors is an integer number (925821852480).

Almost surely, 2^{21121202022220} is an apocalyptic number.

21121202022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121202022220 is an abundant number, since it is smaller than the sum of its proper divisors (23318246896820).

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

21121202022220 is a wasteful number, since it uses less digits than its factorization.

21121202022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464782 (or 464780 counting only the distinct ones).

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

Adding to 21121202022220 its reverse (2222020212112), we get a palindrome (23343222234332).

The spelling of 21121202022220 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred two million, twenty-two thousand, two hundred twenty".