21318260337 has 12 divisors (see below), whose sum is σ = 33592410384. Its totient is φ = 12920157720.

The previous prime is 21318260317. The next prime is 21318260339. The reversal of 21318260337 is 73306281312.

21318260337 is a `hidden beast` number, since 2 + 1 + 3 + 18 + 2 + 603 + 37 = 666.

It is not a de Polignac number, because 21318260337 - 2⁶ = 21318260273 is a prime.

It is a super-2 number, since 2×21318260337² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21318260339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107667883 + ... + 107668080.

It is an arithmetic number, because the mean of its divisors is an integer number (2799367532).

Almost surely, 2^21318260337 is an apocalyptic number.

It is an amenable number.

21318260337 is a deficient number, since it is larger than the sum of its proper divisors (12274150047).

21318260337 is a wasteful number, since it uses less digits than its factorization.

21318260337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215335980 (or 215335977 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 21318260337 in words is "twenty-one billion, three hundred eighteen million, two hundred sixty thousand, three hundred thirty-seven".