21023163 has 12 divisors (see below), whose sum is σ = 34705008. Its totient is φ = 12013200.

The previous prime is 21023161. The next prime is 21023183. The reversal of 21023163 is 36132012.

It is not a de Polignac number, because 21023163 - 2¹ = 21023161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023161) 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, 166788 + ... + 166913.

It is an arithmetic number, because the mean of its divisors is an integer number (2892084).

Almost surely, 2^21023163 is an apocalyptic number.

21023163 is a deficient number, since it is larger than the sum of its proper divisors (13681845).

21023163 is a wasteful number, since it uses less digits than its factorization.

21023163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333714 (or 333711 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21023163 is about 4585.1022889353. The cubic root of 21023163 is about 275.9938168117.

Adding to 21023163 its reverse (36132012), we get a palindrome (57155175).

It can be divided in two parts, 2 and 1023163, that added together give a triangular number (1023165 = T₁₄₃₀).

The spelling of 21023163 in words is "twenty-one million, twenty-three thousand, one hundred sixty-three".