22131623 has 4 divisors (see below), whose sum is σ = 22443408. Its totient is φ = 21819840.

The previous prime is 22131619. The next prime is 22131631. The reversal of 22131623 is 32613122.

It is a happy number.

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 22131623 - 2² = 22131619 is a prime.

It is a super-2 number, since 2×22131623² = 979617473228258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22131595 and 22131604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131643) 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, 155786 + ... + 155927.

It is an arithmetic number, because the mean of its divisors is an integer number (5610852).

Almost surely, 2^22131623 is an apocalyptic number.

22131623 is a deficient number, since it is larger than the sum of its proper divisors (311785).

22131623 is an equidigital number, since it uses as much as digits as its factorization.

22131623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311784.

The product of its digits is 432, while the sum is 20.

The square root of 22131623 is about 4704.4258948356. The cubic root of 22131623 is about 280.7616296396.

Adding to 22131623 its reverse (32613122), we get a palindrome (54744745).

The spelling of 22131623 in words is "twenty-two million, one hundred thirty-one thousand, six hundred twenty-three".