20121021021120 has 112 divisors (see below), whose sum is σ = 63886957580160. Its totient is φ = 5365377504256.

The previous prime is 20121021021097. The next prime is 20121021021169. The reversal of 20121021021120 is 2112012012102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20121021021120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22778419 + ... + 23645261.

Almost surely, 2^{20121021021120} is an apocalyptic number.

20121021021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121021021120 is an abundant number, since it is smaller than the sum of its proper divisors (43765936559040).

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

20121021021120 is a wasteful number, since it uses less digits than its factorization.

20121021021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891042 (or 891032 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121021021120 its reverse (2112012012102), we get a palindrome (22233033033222).

The spelling of 20121021021120 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, twenty-one thousand, one hundred twenty".