20100021000120 has 96 divisors (see below), whose sum is σ = 66844255935600. Its totient is φ = 5235354302976.

The previous prime is 20100021000119. The next prime is 20100021000127. The reversal of 20100021000120 is 2100012000102.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100021000127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649210005 + ... + 649240964.

Almost surely, 2^{20100021000120} is an apocalyptic number.

20100021000120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100021000120 is an abundant number, since it is smaller than the sum of its proper divisors (46744234935480).

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

20100021000120 is a wasteful number, since it uses less digits than its factorization.

20100021000120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298451029 (or 1298451022 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20100021000120 its reverse (2100012000102), we get a palindrome (22200033000222).

The spelling of 20100021000120 in words is "twenty trillion, one hundred billion, twenty-one million, one hundred twenty", and thus it is an aban number.