212256505477 has 2 divisors, whose sum is σ = 212256505478. Its totient is φ = 212256505476.

The previous prime is 212256505453. The next prime is 212256505493. The reversal of 212256505477 is 774505652212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151812316161 + 60444189316 = 389631^2 + 245854^2 .

It is a cyclic number.

It is not a de Polignac number, because 212256505477 - 2¹¹ = 212256503429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212256505777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106128252738 + 106128252739.

It is an arithmetic number, because the mean of its divisors is an integer number (106128252739).

Almost surely, 2^212256505477 is an apocalyptic number.

It is an amenable number.

212256505477 is a deficient number, since it is larger than the sum of its proper divisors (1).

212256505477 is an equidigital number, since it uses as much as digits as its factorization.

212256505477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 212256505477 in words is "two hundred twelve billion, two hundred fifty-six million, five hundred five thousand, four hundred seventy-seven".