21523745863 has 8 divisors (see below), whose sum is σ = 21647991456. Its totient is φ = 21399559200.

The previous prime is 21523745801. The next prime is 21523745869. The reversal of 21523745863 is 36854732512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21523745863 - 2²⁵ = 21490191431 is a prime.

It is a super-2 number, since 2×21523745863² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523745869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869445 + ... + 893857.

It is an arithmetic number, because the mean of its divisors is an integer number (2705998932).

Almost surely, 2^21523745863 is an apocalyptic number.

21523745863 is a deficient number, since it is larger than the sum of its proper divisors (124245593).

21523745863 is a wasteful number, since it uses less digits than its factorization.

21523745863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29465.

The product of its digits is 1209600, while the sum is 46.

The spelling of 21523745863 in words is "twenty-one billion, five hundred twenty-three million, seven hundred forty-five thousand, eight hundred sixty-three".