22131145 has 8 divisors (see below), whose sum is σ = 26586504. Its totient is φ = 17685504.

The previous prime is 22131133. The next prime is 22131199. The reversal of 22131145 is 54113122.

It can be written as a sum of positive squares in 4 ways, for example, as 116281 + 22014864 = 341^2 + 4692^2 .

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 22131145 - 2⁵ = 22131113 is a prime.

It is a super-2 number, since 2×22131145² = 979575158022050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4267 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (3323313).

Almost surely, 2^22131145 is an apocalyptic number.

It is an amenable number.

22131145 is a deficient number, since it is larger than the sum of its proper divisors (4455359).

22131145 is a wasteful number, since it uses less digits than its factorization.

22131145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4859.

The product of its digits is 240, while the sum is 19.

The square root of 22131145 is about 4704.3750913378. The cubic root of 22131145 is about 280.7596083234.

Adding to 22131145 its reverse (54113122), we get a palindrome (76244267).

The spelling of 22131145 in words is "twenty-two million, one hundred thirty-one thousand, one hundred forty-five".