21063136277 has 2 divisors, whose sum is σ = 21063136278. Its totient is φ = 21063136276.

The previous prime is 21063136273. The next prime is 21063136321. The reversal of 21063136277 is 77263136012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10824529681 + 10238606596 = 104041^2 + 101186^2 .

It is a cyclic number.

It is not a de Polignac number, because 21063136277 - 2² = 21063136273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21063136277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21063136273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531568138 + 10531568139.

It is an arithmetic number, because the mean of its divisors is an integer number (10531568139).

Almost surely, 2^21063136277 is an apocalyptic number.

It is an amenable number.

21063136277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063136277 is an equidigital number, since it uses as much as digits as its factorization.

21063136277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 38.

The spelling of 21063136277 in words is "twenty-one billion, sixty-three million, one hundred thirty-six thousand, two hundred seventy-seven".