21122102011220 has 48 divisors (see below), whose sum is σ = 50693414405760. Its totient is φ = 7241810749824.

The previous prime is 21122102011169. The next prime is 21122102011229. The reversal of 21122102011220 is 2211020122112.

It is a super-2 number, since 2×21122102011220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122102011229) 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, 22017002 + ... + 22956318.

It is an arithmetic number, because the mean of its divisors is an integer number (1056112800120).

Almost surely, 2^{21122102011220} is an apocalyptic number.

21122102011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122102011220 is an abundant number, since it is smaller than the sum of its proper divisors (29571312394540).

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

21122102011220 is a wasteful number, since it uses less digits than its factorization.

21122102011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099952 (or 1099950 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122102011220 its reverse (2211020122112), we get a palindrome (23333122133332).

The spelling of 21122102011220 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, eleven thousand, two hundred twenty".