21260780937 has 40 divisors (see below), whose sum is σ = 35583664512. Its totient is φ = 12537050400.

The previous prime is 21260780923. The next prime is 21260780977. The reversal of 21260780937 is 73908706212.

21260780937 is a `hidden beast` number, since 2 + 1 + 2 + 607 + 8 + 0 + 9 + 37 = 666.

It is not a de Polignac number, because 21260780937 - 2¹⁰ = 21260779913 is a prime.

It is a super-2 number, since 2×21260780937² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21260780892 and 21260780901.

It is not an unprimeable number, because it can be changed into a prime (21260780977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 289489 + ... + 355422.

Almost surely, 2^21260780937 is an apocalyptic number.

21260780937 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21260780937 is a deficient number, since it is larger than the sum of its proper divisors (14322883575).

21260780937 is a wasteful number, since it uses less digits than its factorization.

21260780937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644971 (or 644962 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21260780937 in words is "twenty-one billion, two hundred sixty million, seven hundred eighty thousand, nine hundred thirty-seven".