20121121100 has 72 divisors (see below), whose sum is σ = 44038587600. Its totient is φ = 7979499520.

The previous prime is 20121121067. The next prime is 20121121151. The reversal of 20121121100 is 112112102.

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, 5832176 + ... + 5835624.

It is an arithmetic number, because the mean of its divisors is an integer number (611647050).

Almost surely, 2^20121121100 is an apocalyptic number.

20121121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121121100 is an abundant number, since it is smaller than the sum of its proper divisors (23917466500).

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

20121121100 is a wasteful number, since it uses less digits than its factorization.

20121121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947 (or 3940 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121121100 its reverse (112112102), we get a palindrome (20233233202).

The spelling of 20121121100 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred".