21780522284 has 6 divisors (see below), whose sum is σ = 38115914004. Its totient is φ = 10890261140.

The previous prime is 21780522259. The next prime is 21780522307. The reversal of 21780522284 is 48222508712.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2722565282 + ... + 2722565289.

It is an arithmetic number, because the mean of its divisors is an integer number (6352652334).

Almost surely, 2^21780522284 is an apocalyptic number.

It is an amenable number.

21780522284 is a deficient number, since it is larger than the sum of its proper divisors (16335391720).

21780522284 is a wasteful number, since it uses less digits than its factorization.

21780522284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445130575 (or 5445130573 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 41.

The spelling of 21780522284 in words is "twenty-one billion, seven hundred eighty million, five hundred twenty-two thousand, two hundred eighty-four".