22180381 has 4 divisors (see below), whose sum is σ = 22652352. Its totient is φ = 21708412.

The previous prime is 22180357. The next prime is 22180399. The reversal of 22180381 is 18308122.

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 22180381 - 2⁹ = 22179869 is a prime.

It is a super-2 number, since 2×22180381² = 983938602610322, 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 (22180321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235915 + ... + 236008.

It is an arithmetic number, because the mean of its divisors is an integer number (5663088).

Almost surely, 2^22180381 is an apocalyptic number.

It is an amenable number.

22180381 is a deficient number, since it is larger than the sum of its proper divisors (471971).

22180381 is an equidigital number, since it uses as much as digits as its factorization.

22180381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471970.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 22180381 is about 4709.6051851509. The cubic root of 22180381 is about 280.9676596393.

The spelling of 22180381 in words is "twenty-two million, one hundred eighty thousand, three hundred eighty-one".