22201231 has 4 divisors (see below), whose sum is σ = 23909032. Its totient is φ = 20493432.

The previous prime is 22201217. The next prime is 22201237. The reversal of 22201231 is 13210222.

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

It is a cyclic number.

It is not a de Polignac number, because 22201231 - 2⁵ = 22201199 is a prime.

It is a super-2 number, since 2×22201231² = 985789315830722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1707787 = 22201231 / (2 + 2 + 2 + 0 + 1 + 2 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853881 + ... + 853906.

It is an arithmetic number, because the mean of its divisors is an integer number (5977258).

Almost surely, 2^22201231 is an apocalyptic number.

22201231 is a deficient number, since it is larger than the sum of its proper divisors (1707801).

22201231 is a wasteful number, since it uses less digits than its factorization.

22201231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707800.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 22201231 is about 4711.8182265448. The cubic root of 22201231 is about 281.0556704669.

Adding to 22201231 its reverse (13210222), we get a palindrome (35411453).

The spelling of 22201231 in words is "twenty-two million, two hundred one thousand, two hundred thirty-one".