12013403621 has 2 divisors, whose sum is σ = 12013403622. Its totient is φ = 12013403620.

The previous prime is 12013403609. The next prime is 12013403627. The reversal of 12013403621 is 12630431021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11713732900 + 299670721 = 108230^2 + 17311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12013403621 is a prime.

It is a super-2 number, since 2×12013403621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12013403627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006701810 + 6006701811.

It is an arithmetic number, because the mean of its divisors is an integer number (6006701811).

Almost surely, 2^12013403621 is an apocalyptic number.

It is an amenable number.

12013403621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013403621 is an equidigital number, since it uses as much as digits as its factorization.

12013403621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 12013403621 its reverse (12630431021), we get a palindrome (24643834642).

The spelling of 12013403621 in words is "twelve billion, thirteen million, four hundred three thousand, six hundred twenty-one".