21102122101220 has 24 divisors (see below), whose sum is σ = 44404709908608. Its totient is φ = 8423657698400.

The previous prime is 21102122101217. The next prime is 21102122101243. The reversal of 21102122101220 is 2210122120112.

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, 1074436316 + ... + 1074455955.

It is an arithmetic number, because the mean of its divisors is an integer number (1850196246192).

Almost surely, 2^{21102122101220} is an apocalyptic number.

21102122101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102122101220 is an abundant number, since it is smaller than the sum of its proper divisors (23302587807388).

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

21102122101220 is a wasteful number, since it uses less digits than its factorization.

21102122101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148892771 (or 2148892769 counting only the distinct ones).

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

Adding to 21102122101220 its reverse (2210122120112), we get a palindrome (23312244221332).

The spelling of 21102122101220 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-two million, one hundred one thousand, two hundred twenty".