21259769264 has 20 divisors (see below), whose sum is σ = 41205595560. Its totient is φ = 10626067200.

The previous prime is 21259769261. The next prime is 21259769269. The reversal of 21259769264 is 46296795212.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21259769261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192374 + ... + 282005.

It is an arithmetic number, because the mean of its divisors is an integer number (2060279778).

Almost surely, 2^21259769264 is an apocalyptic number.

It is an amenable number.

21259769264 is a deficient number, since it is larger than the sum of its proper divisors (19945826296).

21259769264 is a wasteful number, since it uses less digits than its factorization.

21259769264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477188 (or 477182 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 53.

The spelling of 21259769264 in words is "twenty-one billion, two hundred fifty-nine million, seven hundred sixty-nine thousand, two hundred sixty-four".