22154381 has 4 divisors (see below), whose sum is σ = 22253952. Its totient is φ = 22054812.

The previous prime is 22154369. The next prime is 22154389. The reversal of 22154381 is 18345122.

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 22154381 - 2¹⁰ = 22153357 is a prime.

It is a super-2 number, since 2×22154381² = 981633194986322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22154381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22154389) 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, 49451 + ... + 49896.

It is an arithmetic number, because the mean of its divisors is an integer number (5563488).

Almost surely, 2^22154381 is an apocalyptic number.

It is an amenable number.

22154381 is a deficient number, since it is larger than the sum of its proper divisors (99571).

22154381 is an equidigital number, since it uses as much as digits as its factorization.

22154381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99570.

The product of its digits is 1920, while the sum is 26.

The square root of 22154381 is about 4706.8440594522. The cubic root of 22154381 is about 280.8578326200.

The spelling of 22154381 in words is "twenty-two million, one hundred fifty-four thousand, three hundred eighty-one".