20120002120100 has 36 divisors (see below), whose sum is σ = 43694067491844. Its totient is φ = 8041795706880.

The previous prime is 20120002120067. The next prime is 20120002120147. The reversal of 20120002120100 is 102120002102.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1456081449124 + 18663920670976 = 1206682^2 + 4320176^2 .

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, 77433917 + ... + 77693316.

Almost surely, 2^{20120002120100} is an apocalyptic number.

20120002120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120002120100 is an abundant number, since it is smaller than the sum of its proper divisors (23574065371744).

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

20120002120100 is a wasteful number, since it uses less digits than its factorization.

20120002120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155128544 (or 155128537 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20120002120100 its reverse (102120002102), we get a palindrome (20222122122202).

The spelling of 20120002120100 in words is "twenty trillion, one hundred twenty billion, two million, one hundred twenty thousand, one hundred".