21252716254412 has 48 divisors (see below), whose sum is σ = 37630948363008. Its totient is φ = 10501419571200.

The previous prime is 21252716254369. The next prime is 21252716254447. The reversal of 21252716254412 is 21445261725212.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 1612857968 + ... + 1612871144.

It is an arithmetic number, because the mean of its divisors is an integer number (783978090896).

Almost surely, 2^{21252716254412} is an apocalyptic number.

It is an amenable number.

21252716254412 is a deficient number, since it is larger than the sum of its proper divisors (16378232108596).

21252716254412 is a wasteful number, since it uses less digits than its factorization.

21252716254412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20466 (or 20464 counting only the distinct ones).

The product of its digits is 537600, while the sum is 44.

Adding to 21252716254412 its reverse (21445261725212), we get a palindrome (42697977979624).

The spelling of 21252716254412 in words is "twenty-one trillion, two hundred fifty-two billion, seven hundred sixteen million, two hundred fifty-four thousand, four hundred twelve".