12120010021 has 16 divisors (see below), whose sum is σ = 13926297600. Its totient is φ = 10332545328.

The previous prime is 12120010003. The next prime is 12120010033. The reversal of 12120010021 is 12001002121.

It is not a de Polignac number, because 12120010021 - 2⁷ = 12120009893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120010051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1533546 + ... + 1541428.

It is an arithmetic number, because the mean of its divisors is an integer number (870393600).

Almost surely, 2^12120010021 is an apocalyptic number.

It is an amenable number.

12120010021 is a deficient number, since it is larger than the sum of its proper divisors (1806287579).

12120010021 is an equidigital number, since it uses as much as digits as its factorization.

12120010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9048.

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

Adding to 12120010021 its reverse (12001002121), we get a palindrome (24121012142).

The spelling of 12120010021 in words is "twelve billion, one hundred twenty million, ten thousand, twenty-one".