20120121100 has 36 divisors (see below), whose sum is σ = 43739169264. Its totient is φ = 8033577280.

The previous prime is 20120121071. The next prime is 20120121137. The reversal of 20120121100 is 112102102.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 124912 + ... + 236311.

It is an arithmetic number, because the mean of its divisors is an integer number (1214976924).

Almost surely, 2^20120121100 is an apocalyptic number.

20120121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120121100 is an abundant number, since it is smaller than the sum of its proper divisors (23619048164).

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

20120121100 is a wasteful number, since it uses less digits than its factorization.

20120121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361794 (or 361787 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20120121100 its reverse (112102102), we get a palindrome (20232223202).

The spelling of 20120121100 in words is "twenty billion, one hundred twenty million, one hundred twenty-one thousand, one hundred".