21302505145144 has 32 divisors (see below), whose sum is σ = 41319823255200. Its totient is φ = 10283891103360.

The previous prime is 21302505145139. The next prime is 21302505145247. The reversal of 21302505145144 is 44154150520312.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 41961709 + ... + 42466339.

It is an arithmetic number, because the mean of its divisors is an integer number (1291244476725).

Almost surely, 2^{21302505145144} is an apocalyptic number.

It is an amenable number.

21302505145144 is a deficient number, since it is larger than the sum of its proper divisors (20017318110056).

21302505145144 is a wasteful number, since it uses less digits than its factorization.

21302505145144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686623 (or 686619 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 21302505145144 its reverse (44154150520312), we get a palindrome (65456655665456).

The spelling of 21302505145144 in words is "twenty-one trillion, three hundred two billion, five hundred five million, one hundred forty-five thousand, one hundred forty-four".