12055111657621 has 2 divisors, whose sum is σ = 12055111657622. Its totient is φ = 12055111657620.

The previous prime is 12055111657573. The next prime is 12055111657637. The reversal of 12055111657621 is 12675611155021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8757397304100 + 3297714353521 = 2959290^2 + 1815961^2 .

It is a cyclic number.

It is not a de Polignac number, because 12055111657621 - 2⁹ = 12055111657109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12055111687621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6027555828810 + 6027555828811.

It is an arithmetic number, because the mean of its divisors is an integer number (6027555828811).

Almost surely, 2^{12055111657621} is an apocalyptic number.

It is an amenable number.

12055111657621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12055111657621 is an equidigital number, since it uses as much as digits as its factorization.

12055111657621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 43.

The spelling of 12055111657621 in words is "twelve trillion, fifty-five billion, one hundred eleven million, six hundred fifty-seven thousand, six hundred twenty-one".