21492303 has 16 divisors (see below), whose sum is σ = 33513216. Its totient is φ = 11995200.

The previous prime is 21492259. The next prime is 21492349. The reversal of 21492303 is 30329412.

It is not a de Polignac number, because 21492303 - 2⁶ = 21492239 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10998 + ... + 12803.

It is an arithmetic number, because the mean of its divisors is an integer number (2094576).

Almost surely, 2^21492303 is an apocalyptic number.

21492303 is a deficient number, since it is larger than the sum of its proper divisors (12020913).

21492303 is a wasteful number, since it uses less digits than its factorization.

21492303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23854.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21492303 is about 4635.9791845952. The cubic root of 21492303 is about 278.0317019555.

The spelling of 21492303 in words is "twenty-one million, four hundred ninety-two thousand, three hundred three".