21864335623 has 12 divisors (see below), whose sum is σ = 23712293808. Its totient is φ = 20151168960.

The previous prime is 21864335617. The next prime is 21864335641. The reversal of 21864335623 is 32653346812.

It is not a de Polignac number, because 21864335623 - 2¹³ = 21864327431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21864335623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21864335653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9363 + ... + 209323.

It is an arithmetic number, because the mean of its divisors is an integer number (1976024484).

Almost surely, 2^21864335623 is an apocalyptic number.

21864335623 is a deficient number, since it is larger than the sum of its proper divisors (1847958185).

21864335623 is a wasteful number, since it uses less digits than its factorization.

21864335623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200634 (or 200621 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The spelling of 21864335623 in words is "twenty-one billion, eight hundred sixty-four million, three hundred thirty-five thousand, six hundred twenty-three".