22123731 has 8 divisors (see below), whose sum is σ = 33712384. Its totient is φ = 12642120.

The previous prime is 22123729. The next prime is 22123753. The reversal of 22123731 is 13732122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22123731 - 2¹ = 22123729 is a prime.

It is a super-2 number, since 2×22123731² = 978918946720722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1053511 = 22123731 / (2 + 2 + 1 + 2 + 3 + 7 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22123698 and 22123707.

It is not an unprimeable number, because it can be changed into a prime (22122731) 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, 526735 + ... + 526776.

It is an arithmetic number, because the mean of its divisors is an integer number (4214048).

Almost surely, 2^22123731 is an apocalyptic number.

22123731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22123731 is a deficient number, since it is larger than the sum of its proper divisors (11588653).

22123731 is a wasteful number, since it uses less digits than its factorization.

22123731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053521.

The product of its digits is 504, while the sum is 21.

The square root of 22123731 is about 4703.5870354443. The cubic root of 22123731 is about 280.7282530513.

Adding to 22123731 its reverse (13732122), we get a palindrome (35855853).

It can be divided in two parts, 22 and 123731, that added together give a triangular number (123753 = T₄₉₇).

The spelling of 22123731 in words is "twenty-two million, one hundred twenty-three thousand, seven hundred thirty-one".