22001331 has 8 divisors (see below), whose sum is σ = 32001984. Its totient is φ = 13334120.

The previous prime is 22001327. The next prime is 22001333. The reversal of 22001331 is 13310022.

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 22001331 - 2² = 22001327 is a prime.

It is a super-2 number, since 2×22001331² = 968117131543122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22001333) 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, 333321 + ... + 333386.

It is an arithmetic number, because the mean of its divisors is an integer number (4000248).

Almost surely, 2^22001331 is an apocalyptic number.

22001331 is a deficient number, since it is larger than the sum of its proper divisors (10000653).

22001331 is a wasteful number, since it uses less digits than its factorization.

22001331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666721.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 22001331 is about 4690.5576427542. The cubic root of 22001331 is about 280.2095837309.

Adding to 22001331 its reverse (13310022), we get a palindrome (35311353).

The spelling of 22001331 in words is "twenty-two million, one thousand, three hundred thirty-one".