21464505243 has 12 divisors (see below), whose sum is σ = 31151227848. Its totient is φ = 14241850560.

The previous prime is 21464505193. The next prime is 21464505299. The reversal of 21464505243 is 34250546412.

21464505243 is a `hidden beast` number, since 2 + 1 + 4 + 645 + 0 + 5 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 21464505243 - 2¹⁰ = 21464504219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21464505198 and 21464505207.

It is not an unprimeable number, because it can be changed into a prime (21464505043) 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, 5649630 + ... + 5653427.

It is an arithmetic number, because the mean of its divisors is an integer number (2595935654).

Almost surely, 2^21464505243 is an apocalyptic number.

21464505243 is a deficient number, since it is larger than the sum of its proper divisors (9686722605).

21464505243 is a wasteful number, since it uses less digits than its factorization.

21464505243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11303274 (or 11303271 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 21464505243 in words is "twenty-one billion, four hundred sixty-four million, five hundred five thousand, two hundred forty-three".