21260680771287 has 16 divisors (see below), whose sum is σ = 29295919669248. Its totient is φ = 13700674134240.

The previous prime is 21260680771279. The next prime is 21260680771301. The reversal of 21260680771287 is 78217708606212.

It is not a de Polignac number, because 21260680771287 - 2³ = 21260680771279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260680771277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132370188 + ... + 132530705.

It is an arithmetic number, because the mean of its divisors is an integer number (1830994979328).

Almost surely, 2^{21260680771287} is an apocalyptic number.

21260680771287 is a deficient number, since it is larger than the sum of its proper divisors (8035238897961).

21260680771287 is a wasteful number, since it uses less digits than its factorization.

21260680771287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264901790.

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 21260680771287 in words is "twenty-one trillion, two hundred sixty billion, six hundred eighty million, seven hundred seventy-one thousand, two hundred eighty-seven".