20120000010021 has 12 divisors (see below), whose sum is σ = 29062297697472. Its totient is φ = 13413298511976.

The previous prime is 20120000009999. The next prime is 20120000010023. The reversal of 20120000010021 is 12001000002102.

It is not a de Polignac number, because 20120000010021 - 2²¹ = 20119997912869 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 = 20120000009985 and 20120000010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120000010023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1037950 + ... + 6427856.

It is an arithmetic number, because the mean of its divisors is an integer number (2421858141456).

Almost surely, 2^{20120000010021} is an apocalyptic number.

It is an amenable number.

20120000010021 is a deficient number, since it is larger than the sum of its proper divisors (8942297687451).

20120000010021 is a wasteful number, since it uses less digits than its factorization.

20120000010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5804680 (or 5804677 counting only the distinct ones).

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

Adding to 20120000010021 its reverse (12001000002102), we get a palindrome (32121000012123).

The spelling of 20120000010021 in words is "twenty trillion, one hundred twenty billion, ten thousand, twenty-one".