21650148432784 has 135 divisors (see below), whose sum is σ = 43609466602611. Its totient is φ = 10412234622720.

The previous prime is 21650148432779. The next prime is 21650148432793. The reversal of 21650148432784 is 48723484105612.

The square root of 21650148432784 is 4652972.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7853504400 + 21642294928384 = 88620^2 + 4652128^2 .

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 26 ways as a sum of consecutive naturals, for example, 102607338439 + ... + 102607338649.

Almost surely, 2^{21650148432784} is an apocalyptic number.

21650148432784 is the 4652972-nd square number.

It is an amenable number.

21650148432784 is an abundant number, since it is smaller than the sum of its proper divisors (21959318169827).

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

21650148432784 is an frugal number, since it uses more digits than its factorization.

21650148432784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 55.

The spelling of 21650148432784 in words is "twenty-one trillion, six hundred fifty billion, one hundred forty-eight million, four hundred thirty-two thousand, seven hundred eighty-four".