20100212100 has 144 divisors (see below), whose sum is σ = 68019604800. Its totient is φ = 5077935360.

The previous prime is 20100212059. The next prime is 20100212117. The reversal of 20100212100 is 121200102.

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 47 ways as a sum of consecutive naturals, for example, 144609 + ... + 247208.

Almost surely, 2^20100212100 is an apocalyptic number.

20100212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100212100 is an abundant number, since it is smaller than the sum of its proper divisors (47919392700).

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

20100212100 is a wasteful number, since it uses less digits than its factorization.

20100212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391859 (or 391846 counting only the distinct ones).

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

Adding to 20100212100 its reverse (121200102), we get a palindrome (20221412202).

The spelling of 20100212100 in words is "twenty billion, one hundred million, two hundred twelve thousand, one hundred".