20100122100 has 108 divisors (see below), whose sum is σ = 64468019616. Its totient is φ = 5235370560.

The previous prime is 20100122093. The next prime is 20100122101. The reversal of 20100122100 is 122100102.

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

20100122100 is a modest number, since divided by 122100 gives 20100 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100122101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 220992 + ... + 298391.

Almost surely, 2^20100122100 is an apocalyptic number.

20100122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100122100 is an abundant number, since it is smaller than the sum of its proper divisors (44367897516).

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

20100122100 is a wasteful number, since it uses less digits than its factorization.

20100122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519446 (or 519436 counting only the distinct ones).

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

Adding to 20100122100 its reverse (122100102), we get a palindrome (20222222202).

The spelling of 20100122100 in words is "twenty billion, one hundred million, one hundred twenty-two thousand, one hundred".