21564227734 has 48 divisors (see below), whose sum is σ = 38110003200. Its totient is φ = 8964279360.

The previous prime is 21564227717. The next prime is 21564227747. The reversal of 21564227734 is 43772246512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4210027 + ... + 4215145.

It is an arithmetic number, because the mean of its divisors is an integer number (793958400).

Almost surely, 2^21564227734 is an apocalyptic number.

21564227734 is a deficient number, since it is larger than the sum of its proper divisors (16545775466).

21564227734 is a wasteful number, since it uses less digits than its factorization.

21564227734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5389 (or 5348 counting only the distinct ones).

The product of its digits is 564480, while the sum is 43.

The spelling of 21564227734 in words is "twenty-one billion, five hundred sixty-four million, two hundred twenty-seven thousand, seven hundred thirty-four".