21111000022220 has 24 divisors (see below), whose sum is σ = 44358476823024. Its totient is φ = 8439566337216.

The previous prime is 21111000022219. The next prime is 21111000022309. The reversal of 21111000022220 is 2222000011112.

It is a junction number, because it is equal to n+sod(n) for n = 21111000022195 and 21111000022204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302068667 + ... + 302138546.

It is an arithmetic number, because the mean of its divisors is an integer number (1848269867626).

Almost surely, 2^{21111000022220} is an apocalyptic number.

21111000022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111000022220 is an abundant number, since it is smaller than the sum of its proper divisors (23247476800804).

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

21111000022220 is a wasteful number, since it uses less digits than its factorization.

21111000022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604208969 (or 604208967 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21111000022220 its reverse (2222000011112), we get a palindrome (23333000033332).

The spelling of 21111000022220 in words is "twenty-one trillion, one hundred eleven billion, twenty-two thousand, two hundred twenty".