2121666592061 has 2 divisors, whose sum is σ = 2121666592062. Its totient is φ = 2121666592060.

The previous prime is 2121666592039. The next prime is 2121666592081. The reversal of 2121666592061 is 1602956661212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2121666080836 + 511225 = 1456594^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121666592061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121666591997 and 2121666592015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121666592081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060833296030 + 1060833296031.

It is an arithmetic number, because the mean of its divisors is an integer number (1060833296031).

Almost surely, 2^{2121666592061} is an apocalyptic number.

It is an amenable number.

2121666592061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121666592061 is an equidigital number, since it uses as much as digits as its factorization.

2121666592061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 2121666592061 in words is "two trillion, one hundred twenty-one billion, six hundred sixty-six million, five hundred ninety-two thousand, sixty-one".