12001210021 has 4 divisors (see below), whose sum is σ = 12002432044. Its totient is φ = 11999988000.

The previous prime is 12001210019. The next prime is 12001210031.

12001210021 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8037122500 + 3964087521 = 89650^2 + 62961^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001210021 - 2¹ = 12001210019 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 (12001210031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596160 + ... + 615961.

It is an arithmetic number, because the mean of its divisors is an integer number (3000608011).

Almost surely, 2^12001210021 is an apocalyptic number.

It is an amenable number.

12001210021 is a deficient number, since it is larger than the sum of its proper divisors (1222023).

12001210021 is an equidigital number, since it uses as much as digits as its factorization.

12001210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222022.

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

The spelling of 12001210021 in words is "twelve billion, one million, two hundred ten thousand, twenty-one".