12061618021 has 2 divisors, whose sum is σ = 12061618022. Its totient is φ = 12061618020.

The previous prime is 12061618007. The next prime is 12061618067. The reversal of 12061618021 is 12081616021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12058236100 + 3381921 = 109810^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12061618021 - 2⁵ = 12061617989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12061618001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6030809010 + 6030809011.

It is an arithmetic number, because the mean of its divisors is an integer number (6030809011).

Almost surely, 2^12061618021 is an apocalyptic number.

It is an amenable number.

12061618021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12061618021 is an equidigital number, since it uses as much as digits as its factorization.

12061618021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 12061618021 in words is "twelve billion, sixty-one million, six hundred eighteen thousand, twenty-one".