21022110221220 has 48 divisors (see below), whose sum is σ = 65402120689920. Its totient is φ = 5605896058848.

The previous prime is 21022110221179. The next prime is 21022110221227. The reversal of 21022110221220 is 2212201122012.

It is a happy number.

21022110221220 is a `hidden beast` number, since 2 + 1 + 0 + 221 + 1 + 0 + 221 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21022110221193 and 21022110221202.

It is not an unprimeable number, because it can be changed into a prime (21022110221227) 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, 19464916332 + ... + 19464917411.

It is an arithmetic number, because the mean of its divisors is an integer number (1362544181040).

Almost surely, 2^{21022110221220} is an apocalyptic number.

21022110221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022110221220 is an abundant number, since it is smaller than the sum of its proper divisors (44380010468700).

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

21022110221220 is a wasteful number, since it uses less digits than its factorization.

21022110221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38929833761 (or 38929833753 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21022110221220 its reverse (2212201122012), we get a palindrome (23234311343232).

The spelling of 21022110221220 in words is "twenty-one trillion, twenty-two billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty".