22018331 has 4 divisors (see below), whose sum is σ = 22057464. Its totient is φ = 21979200.

The previous prime is 22018309. The next prime is 22018343. The reversal of 22018331 is 13381022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22018331 is a prime.

It is a super-2 number, since 2×22018331² = 969613800051122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22018301) 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, 18710 + ... + 19851.

It is an arithmetic number, because the mean of its divisors is an integer number (5514366).

Almost surely, 2^22018331 is an apocalyptic number.

22018331 is a deficient number, since it is larger than the sum of its proper divisors (39133).

22018331 is an equidigital number, since it uses as much as digits as its factorization.

22018331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39132.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22018331 is about 4692.3694441082. The cubic root of 22018331 is about 280.2817359800.

Adding to 22018331 its reverse (13381022), we get a palindrome (35399353).

The spelling of 22018331 in words is "twenty-two million, eighteen thousand, three hundred thirty-one".