21883381 has 8 divisors (see below), whose sum is σ = 24142104. Its totient is φ = 19706880.

The previous prime is 21883363. The next prime is 21883397. The reversal of 21883381 is 18338812.

It can be written as a sum of positive squares in 4 ways, for example, as 2160900 + 19722481 = 1470^2 + 4441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21883381 - 2⁵ = 21883349 is a prime.

It is a super-2 number, since 2×21883381² = 957764727982322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21883321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19996 + ... + 21061.

It is an arithmetic number, because the mean of its divisors is an integer number (3017763).

Almost surely, 2^21883381 is an apocalyptic number.

It is an amenable number.

21883381 is a deficient number, since it is larger than the sum of its proper divisors (2258723).

21883381 is a wasteful number, since it uses less digits than its factorization.

21883381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41111.

The product of its digits is 9216, while the sum is 34.

The square root of 21883381 is about 4677.9676142530. The cubic root of 21883381 is about 279.7079480343.

The spelling of 21883381 in words is "twenty-one million, eight hundred eighty-three thousand, three hundred eighty-one".