12477205421 has 2 divisors, whose sum is σ = 12477205422. Its totient is φ = 12477205420.

The previous prime is 12477205417. The next prime is 12477205459. The reversal of 12477205421 is 12450277421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10637653321 + 1839552100 = 103139^2 + 42890^2 .

It is a cyclic number.

It is not a de Polignac number, because 12477205421 - 2² = 12477205417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12477205121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6238602710 + 6238602711.

It is an arithmetic number, because the mean of its divisors is an integer number (6238602711).

Almost surely, 2^12477205421 is an apocalyptic number.

It is an amenable number.

12477205421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12477205421 is an equidigital number, since it uses as much as digits as its factorization.

12477205421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 35.

The spelling of 12477205421 in words is "twelve billion, four hundred seventy-seven million, two hundred five thousand, four hundred twenty-one".