20121122100 has 72 divisors (see below), whose sum is σ = 58782418240. Its totient is φ = 5313530880.

The previous prime is 20121122059. The next prime is 20121122111. The reversal of 20121122100 is 122112102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 294685 + ... + 356484.

Almost surely, 2^20121122100 is an apocalyptic number.

20121122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121122100 is an abundant number, since it is smaller than the sum of its proper divisors (38661296140).

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

20121122100 is a wasteful number, since it uses less digits than its factorization.

20121122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651289 (or 651282 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121122100 its reverse (122112102), we get a palindrome (20243234202).

The spelling of 20121122100 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred".