21260680771252 has 24 divisors (see below), whose sum is σ = 40068399933576. Its totient is φ = 9812574417408.

The previous prime is 21260680771249. The next prime is 21260680771277. The reversal of 21260680771252 is 25217708606212.

It can be written as a sum of positive squares in 4 ways, for example, as 7432798931856 + 13827881839396 = 2726316^2 + 3718586^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21260680771196 and 21260680771205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11320728 + ... + 13064464.

It is an arithmetic number, because the mean of its divisors is an integer number (1669516663899).

Almost surely, 2^{21260680771252} is an apocalyptic number.

It is an amenable number.

21260680771252 is a deficient number, since it is larger than the sum of its proper divisors (18807719162324).

21260680771252 is a wasteful number, since it uses less digits than its factorization.

21260680771252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978227 (or 1978225 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 21260680771252 in words is "twenty-one trillion, two hundred sixty billion, six hundred eighty million, seven hundred seventy-one thousand, two hundred fifty-two".