21360436277 has 2 divisors, whose sum is σ = 21360436278. Its totient is φ = 21360436276.

The previous prime is 21360436259. The next prime is 21360436337. The reversal of 21360436277 is 77263406312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13267814596 + 8092621681 = 115186^2 + 89959^2 .

It is a cyclic number.

It is not a de Polignac number, because 21360436277 - 2⁶ = 21360436213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21360438277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10680218138 + 10680218139.

It is an arithmetic number, because the mean of its divisors is an integer number (10680218139).

Almost surely, 2^21360436277 is an apocalyptic number.

It is an amenable number.

21360436277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21360436277 is an equidigital number, since it uses as much as digits as its factorization.

21360436277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 21360436277 in words is "twenty-one billion, three hundred sixty million, four hundred thirty-six thousand, two hundred seventy-seven".