20100121100 has 36 divisors (see below), whose sum is σ = 44049139008. Its totient is φ = 7960440000.

The previous prime is 20100121091. The next prime is 20100121123. The reversal of 20100121100 is 112100102.

It is a super-3 number, since 3×20100121100³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 984956 + ... + 1005155.

Almost surely, 2^20100121100 is an apocalyptic number.

20100121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100121100 is an abundant number, since it is smaller than the sum of its proper divisors (23949017908).

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

20100121100 is a wasteful number, since it uses less digits than its factorization.

20100121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990226 (or 1990219 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20100121100 its reverse (112100102), we get a palindrome (20212221202).

The spelling of 20100121100 in words is "twenty billion, one hundred million, one hundred twenty-one thousand, one hundred".