21743861764 has 27 divisors (see below), whose sum is σ = 40431086143. Its totient is φ = 10230046208.

The previous prime is 21743861719. The next prime is 21743861767. The reversal of 21743861764 is 46716834712.

The square root of 21743861764 is 147458.

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 3029621764 + 18714240000 = 55042^2 + 136800^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21743861767) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5011404 + ... + 5015740.

Almost surely, 2^21743861764 is an apocalyptic number.

21743861764 is the 147458-th square number.

It is an amenable number.

21743861764 is a deficient number, since it is larger than the sum of its proper divisors (18687224379).

21743861764 is an frugal number, since it uses more digits than its factorization.

21743861764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8712 (or 4356 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 49.

Multiplying 21743861764 by its sum of digits (49), we get a square (1065449226436 = 1032206²).

The spelling of 21743861764 in words is "twenty-one billion, seven hundred forty-three million, eight hundred sixty-one thousand, seven hundred sixty-four".