22115381 has 8 divisors (see below), whose sum is σ = 22772640. Its totient is φ = 21461328.

The previous prime is 22115377. The next prime is 22115389. The reversal of 22115381 is 18351122.

It is a happy number.

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 22115381 - 2² = 22115377 is a prime.

It is a super-2 number, since 2×22115381² = 978180153550322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22115389) 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, 23930 + ... + 24836.

It is an arithmetic number, because the mean of its divisors is an integer number (2846580).

Almost surely, 2^22115381 is an apocalyptic number.

It is an amenable number.

22115381 is a deficient number, since it is larger than the sum of its proper divisors (657259).

22115381 is an equidigital number, since it uses as much as digits as its factorization.

22115381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603.

The product of its digits is 480, while the sum is 23.

The square root of 22115381 is about 4702.6993312352. The cubic root of 22115381 is about 280.6929308615.

The spelling of 22115381 in words is "twenty-two million, one hundred fifteen thousand, three hundred eighty-one".