12477691021 has 2 divisors, whose sum is σ = 12477691022. Its totient is φ = 12477691020.

The previous prime is 12477690997. The next prime is 12477691027. The reversal of 12477691021 is 12019677421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12470188900 + 7502121 = 111670^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 12477691021 - 2¹³ = 12477682829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12477691027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6238845510 + 6238845511.

It is an arithmetic number, because the mean of its divisors is an integer number (6238845511).

Almost surely, 2^12477691021 is an apocalyptic number.

It is an amenable number.

12477691021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12477691021 is an equidigital number, since it uses as much as digits as its factorization.

12477691021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 12477691021 in words is "twelve billion, four hundred seventy-seven million, six hundred ninety-one thousand, twenty-one".