21500032414244 has 24 divisors (see below), whose sum is σ = 38335841035128. Its totient is φ = 10546944262400.

The previous prime is 21500032414177. The next prime is 21500032414279. The reversal of 21500032414244 is 44241423000512.

It can be written as a sum of positive squares in 4 ways, for example, as 10078593102400 + 11421439311844 = 3174680^2 + 3379562^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21500032414244.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8303294 + ... + 10580394.

It is an arithmetic number, because the mean of its divisors is an integer number (1597326709797).

Almost surely, 2^{21500032414244} is an apocalyptic number.

It is an amenable number.

21500032414244 is a deficient number, since it is larger than the sum of its proper divisors (16835808620884).

21500032414244 is a wasteful number, since it uses less digits than its factorization.

21500032414244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321695 (or 2321693 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 21500032414244 its reverse (44241423000512), we get a palindrome (65741455414756).

The spelling of 21500032414244 in words is "twenty-one trillion, five hundred billion, thirty-two million, four hundred fourteen thousand, two hundred forty-four".