21365641304 has 48 divisors (see below), whose sum is σ = 46837802880. Its totient is φ = 9110189760.

The previous prime is 21365641291. The next prime is 21365641307. The reversal of 21365641304 is 40314656312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365641307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61112 + ... + 215559.

It is an arithmetic number, because the mean of its divisors is an integer number (975787560).

Almost surely, 2^21365641304 is an apocalyptic number.

It is an amenable number.

21365641304 is an abundant number, since it is smaller than the sum of its proper divisors (25472161576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21365641304 is a wasteful number, since it uses less digits than its factorization.

21365641304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276888 (or 276877 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21365641304 in words is "twenty-one billion, three hundred sixty-five million, six hundred forty-one thousand, three hundred four".