21412215264 has 48 divisors (see below), whose sum is σ = 61316801280. Its totient is φ = 6488549760.

The previous prime is 21412215257. The next prime is 21412215283. The reversal of 21412215264 is 46251221412.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10137304 + ... + 10139415.

It is an arithmetic number, because the mean of its divisors is an integer number (1277433360).

Almost surely, 2^21412215264 is an apocalyptic number.

21412215264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21412215264 is an abundant number, since it is smaller than the sum of its proper divisors (39904586016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21412215264 is a wasteful number, since it uses less digits than its factorization.

21412215264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20276743 (or 20276735 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

Adding to 21412215264 its reverse (46251221412), we get a palindrome (67663436676).

The spelling of 21412215264 in words is "twenty-one billion, four hundred twelve million, two hundred fifteen thousand, two hundred sixty-four".