20120000100021 has 48 divisors (see below), whose sum is σ = 30188536455168. Its totient is φ = 12899133424800.

The previous prime is 20120000100001. The next prime is 20120000100077. The reversal of 20120000100021 is 12000100002102.

It is not a de Polignac number, because 20120000100021 - 2⁶ = 20120000099957 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 20120000099976 and 20120000100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120000100001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37824120 + ... + 38352366.

It is an arithmetic number, because the mean of its divisors is an integer number (628927842816).

Almost surely, 2^{20120000100021} is an apocalyptic number.

It is an amenable number.

20120000100021 is a deficient number, since it is larger than the sum of its proper divisors (10068536355147).

20120000100021 is a wasteful number, since it uses less digits than its factorization.

20120000100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529142 (or 529139 counting only the distinct ones).

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

Adding to 20120000100021 its reverse (12000100002102), we get a palindrome (32120100102123).

The spelling of 20120000100021 in words is "twenty trillion, one hundred twenty billion, one hundred thousand, twenty-one".