22042381 has 4 divisors (see below), whose sum is σ = 22139712. Its totient is φ = 21945052.

The previous prime is 22042357. The next prime is 22042429. The reversal of 22042381 is 18324022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22042381 - 2¹⁵ = 22009613 is a prime.

It is a super-2 number, since 2×22042381² = 971733120298322, 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 (22042301) 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 3 ways as a sum of consecutive naturals, for example, 48325 + ... + 48778.

It is an arithmetic number, because the mean of its divisors is an integer number (5534928).

Almost surely, 2^22042381 is an apocalyptic number.

It is an amenable number.

22042381 is a deficient number, since it is larger than the sum of its proper divisors (97331).

22042381 is an equidigital number, since it uses as much as digits as its factorization.

22042381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97330.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 22042381 is about 4694.9314158995. The cubic root of 22042381 is about 280.3837467846.

The spelling of 22042381 in words is "twenty-two million, forty-two thousand, three hundred eighty-one".