20010021012100 has 72 divisors (see below), whose sum is σ = 49843464189120. Its totient is φ = 6830355765120.

The previous prime is 20010021012073. The next prime is 20010021012127. The reversal of 20010021012100 is 121012001002.

It is an interprime number because it is at equal distance from previous prime (20010021012073) and next prime (20010021012127).

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 62805295 + ... + 63123094.

It is an arithmetic number, because the mean of its divisors is an integer number (692270335960).

Almost surely, 2^{20010021012100} is an apocalyptic number.

20010021012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010021012100 is an abundant number, since it is smaller than the sum of its proper divisors (29833443177020).

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

20010021012100 is a wasteful number, since it uses less digits than its factorization.

20010021012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125928637 (or 125928630 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20010021012100 its reverse (121012001002), we get a palindrome (20131033013102).

The spelling of 20010021012100 in words is "twenty trillion, ten billion, twenty-one million, twelve thousand, one hundred".