23213281 has 16 divisors (see below), whose sum is σ = 28940800. Its totient is φ = 18128448.

The previous prime is 23213273. The next prime is 23213291. The reversal of 23213281 is 18231232.

It is not a de Polignac number, because 23213281 - 2³ = 23213273 is a prime.

It is a super-2 number, since 2×23213281² = 1077712829569922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23213221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5575 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (1808800).

Almost surely, 2^23213281 is an apocalyptic number.

It is an amenable number.

23213281 is a deficient number, since it is larger than the sum of its proper divisors (5727519).

23213281 is a wasteful number, since it uses less digits than its factorization.

23213281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328.

The product of its digits is 576, while the sum is 22.

The square root of 23213281 is about 4818.0162930401. The cubic root of 23213281 is about 285.2630422624.

The spelling of 23213281 in words is "twenty-three million, two hundred thirteen thousand, two hundred eighty-one".