21383091 has 12 divisors (see below), whose sum is σ = 31019040. Its totient is φ = 14194320.

The previous prime is 21383081. The next prime is 21383101. The reversal of 21383091 is 19038312.

It is an interprime number because it is at equal distance from previous prime (21383081) and next prime (21383101).

It is not a de Polignac number, because 21383091 - 2⁹ = 21382579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21383071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2820 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (2584920).

Almost surely, 2^21383091 is an apocalyptic number.

21383091 is a deficient number, since it is larger than the sum of its proper divisors (9635949).

21383091 is a wasteful number, since it uses less digits than its factorization.

21383091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186 (or 10183 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21383091 is about 4624.1854417832. The cubic root of 21383091 is about 277.5599675612.

The spelling of 21383091 in words is "twenty-one million, three hundred eighty-three thousand, ninety-one".