21265452364 has 24 divisors (see below), whose sum is σ = 40756479120. Its totient is φ = 9648469824.

The previous prime is 21265452331. The next prime is 21265452419. The reversal of 21265452364 is 46325456212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3462619 + ... + 3468754.

It is an arithmetic number, because the mean of its divisors is an integer number (1698186630).

Almost surely, 2^21265452364 is an apocalyptic number.

It is an amenable number.

21265452364 is a deficient number, since it is larger than the sum of its proper divisors (19491026756).

21265452364 is a wasteful number, since it uses less digits than its factorization.

21265452364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6931449 (or 6931447 counting only the distinct ones).

The product of its digits is 345600, while the sum is 40.

The spelling of 21265452364 in words is "twenty-one billion, two hundred sixty-five million, four hundred fifty-two thousand, three hundred sixty-four".