12042491621 has 2 divisors, whose sum is σ = 12042491622. Its totient is φ = 12042491620.

The previous prime is 12042491611. The next prime is 12042491651. The reversal of 12042491621 is 12619424021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10544414596 + 1498077025 = 102686^2 + 38705^2 .

It is a cyclic number.

It is not a de Polignac number, because 12042491621 - 2⁶ = 12042491557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12042491611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6021245810 + 6021245811.

It is an arithmetic number, because the mean of its divisors is an integer number (6021245811).

Almost surely, 2^12042491621 is an apocalyptic number.

It is an amenable number.

12042491621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12042491621 is an equidigital number, since it uses as much as digits as its factorization.

12042491621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 12042491621 in words is "twelve billion, forty-two million, four hundred ninety-one thousand, six hundred twenty-one".