21386305468089 has 33 divisors (see below), whose sum is σ = 32080962833989. Its totient is φ = 14256787804380.

The previous prime is 21386305468043. The next prime is 21386305468111. The reversal of 21386305468089 is 98086450368312.

It is a happy number.

The square root of 21386305468089 is 4624533.

It is a perfect power (a square), and thus also a powerful number.

21386305468089 is a `hidden beast` number, since 2 + 1 + 3 + 8 + 6 + 3 + 0 + 546 + 8 + 0 + 89 = 666.

It is not a de Polignac number, because 21386305468089 - 2²¹ = 21386303370937 is a prime.

It is a super-2 number, since 2×21386305468089² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21386305468589) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 1123752004 + ... + 1123771034.

Almost surely, 2^{21386305468089} is an apocalyptic number.

21386305468089 is the 4624533-rd square number.

21386305468089 is the 2312267-th centered octagonal number.

It is an amenable number.

21386305468089 is a deficient number, since it is larger than the sum of its proper divisors (10694657365900).

21386305468089 is an frugal number, since it uses more digits than its factorization.

21386305468089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38092 (or 19034 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 21386305468089 in words is "twenty-one trillion, three hundred eighty-six billion, three hundred five million, four hundred sixty-eight thousand, eighty-nine".