21634107277 has 2 divisors, whose sum is σ = 21634107278. Its totient is φ = 21634107276.

The previous prime is 21634107251. The next prime is 21634107289. The reversal of 21634107277 is 77270143612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13913146116 + 7720961161 = 117954^2 + 87869^2 .

It is a cyclic number.

It is not a de Polignac number, because 21634107277 - 2²³ = 21625718669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21634107217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817053638 + 10817053639.

It is an arithmetic number, because the mean of its divisors is an integer number (10817053639).

Almost surely, 2^21634107277 is an apocalyptic number.

It is an amenable number.

21634107277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21634107277 is an equidigital number, since it uses as much as digits as its factorization.

21634107277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 40.

The spelling of 21634107277 in words is "twenty-one billion, six hundred thirty-four million, one hundred seven thousand, two hundred seventy-seven".