122100021000 has 128 divisors (see below), whose sum is σ = 423280166400. Its totient is φ = 32559998400.

The previous prime is 122100020983. The next prime is 122100021019. The reversal of 122100021000 is 120001221.

It is a Harshad number since it is a multiple of its sum of digits (9).

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, 2234112 + ... + 2288111.

It is an arithmetic number, because the mean of its divisors is an integer number (3306876300).

Almost surely, 2^122100021000 is an apocalyptic number.

122100021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122100021000 is an abundant number, since it is smaller than the sum of its proper divisors (301180145400).

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

122100021000 is a wasteful number, since it uses less digits than its factorization.

122100021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522253 (or 4522233 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 122100021000 its reverse (120001221), we get a palindrome (122220022221).

The spelling of 122100021000 in words is "one hundred twenty-two billion, one hundred million, twenty-one thousand".