12001010000021 has 32 divisors (see below), whose sum is σ = 14254420320000. Its totient is φ = 10097824214016.

The previous prime is 12001009999981. The next prime is 12001010000081. The reversal of 12001010000021 is 12000001010021.

It is not a de Polignac number, because 12001010000021 - 2¹⁸ = 12001009737877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001009999963 and 12001010000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001010000081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2829125 + ... + 5657381.

It is an arithmetic number, because the mean of its divisors is an integer number (445450635000).

Almost surely, 2^{12001010000021} is an apocalyptic number.

It is an amenable number.

12001010000021 is a deficient number, since it is larger than the sum of its proper divisors (2253410319979).

12001010000021 is an equidigital number, since it uses as much as digits as its factorization.

12001010000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828506 (or 2828492 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 12001010000021 its reverse (12000001010021), we get a palindrome (24001011010042).

The spelling of 12001010000021 in words is "twelve trillion, one billion, ten million, twenty-one", and thus it is an aban number and an uban number.