12010021000021 has 6 divisors (see below), whose sum is σ = 13201097462966. Its totient is φ = 10918200909000.

The previous prime is 12010021000009. The next prime is 12010021000067. The reversal of 12010021000021 is 12000012001021.

It can be written as a sum of positive squares in only one way, i.e., 6952244897521 + 5057776102500 = 2636711^2 + 2248950^2 .

It is not a de Polignac number, because 12010021000021 - 2⁵ = 12010020999989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12010020999971 and 12010021000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12010021000121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49628185830 + ... + 49628186071.

Almost surely, 2^{12010021000021} is an apocalyptic number.

12010021000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12010021000021 is a deficient number, since it is larger than the sum of its proper divisors (1191076462945).

12010021000021 is an equidigital number, since it uses as much as digits as its factorization.

12010021000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99256371923 (or 99256371912 counting only the distinct ones).

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

Adding to 12010021000021 its reverse (12000012001021), we get a palindrome (24010033001042).

The spelling of 12010021000021 in words is "twelve trillion, ten billion, twenty-one million, twenty-one", and thus it is an aban number and an uban number.