21503883023 has 12 divisors (see below), whose sum is σ = 25937413200. Its totient is φ = 17461797696.

The previous prime is 21503883013. The next prime is 21503883041. The reversal of 21503883023 is 32038830512.

It is not a de Polignac number, because 21503883023 - 2¹⁰ = 21503881999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21503883013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4252298 + ... + 4257351.

It is an arithmetic number, because the mean of its divisors is an integer number (2161451100).

Almost surely, 2^21503883023 is an apocalyptic number.

21503883023 is a deficient number, since it is larger than the sum of its proper divisors (4433530177).

21503883023 is an equidigital number, since it uses as much as digits as its factorization.

21503883023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8509694 (or 8509675 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21503883023 in words is "twenty-one billion, five hundred three million, eight hundred eighty-three thousand, twenty-three".