21883665238245 has 40 divisors (see below), whose sum is σ = 39278342388384. Its totient is φ = 11656457858016.

The previous prime is 21883665238213. The next prime is 21883665238249. The reversal of 21883665238245 is 54283256638812.

21883665238245 is a `hidden beast` number, since 2 + 1 + 8 + 8 + 3 + 66 + 523 + 8 + 2 + 45 = 666.

It is not a de Polignac number, because 21883665238245 - 2⁵ = 21883665238213 is a prime.

It is a super-2 number, since 2×21883665238245² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21883665238249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34010199 + ... + 34647668.

Almost surely, 2^{21883665238245} is an apocalyptic number.

It is an amenable number.

21883665238245 is a deficient number, since it is larger than the sum of its proper divisors (17394677150139).

21883665238245 is an equidigital number, since it uses as much as digits as its factorization.

21883665238245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68658671 (or 68658662 counting only the distinct ones).

The product of its digits is 132710400, while the sum is 63.

The spelling of 21883665238245 in words is "twenty-one trillion, eight hundred eighty-three billion, six hundred sixty-five million, two hundred thirty-eight thousand, two hundred forty-five".