21221112000220 has 96 divisors (see below), whose sum is σ = 48669303029760. Its totient is φ = 7708254435840.

The previous prime is 21221112000203. The next prime is 21221112000271. The reversal of 21221112000220 is 2200021112212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21221112000194 and 21221112000203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 855367176 + ... + 855391984.

It is an arithmetic number, because the mean of its divisors is an integer number (506971906560).

Almost surely, 2^{21221112000220} is an apocalyptic number.

21221112000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221112000220 is an abundant number, since it is smaller than the sum of its proper divisors (27448191029540).

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

21221112000220 is a wasteful number, since it uses less digits than its factorization.

21221112000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28963 (or 28961 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221112000220 its reverse (2200021112212), we get a palindrome (23421133112432).

The spelling of 21221112000220 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty", and thus it is an aban number.