22143261 has 8 divisors (see below), whose sum is σ = 33742144. Its totient is φ = 12653280.

The previous prime is 22143229. The next prime is 22143263. The reversal of 22143261 is 16234122.

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

It is not a de Polignac number, because 22143261 - 2⁵ = 22143229 is a prime.

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: 1054441 = 22143261 / (2 + 2 + 1 + 4 + 3 + 2 + 6 + 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 (22143263) 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, 527200 + ... + 527241.

It is an arithmetic number, because the mean of its divisors is an integer number (4217768).

Almost surely, 2^22143261 is an apocalyptic number.

22143261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22143261 is a deficient number, since it is larger than the sum of its proper divisors (11598883).

22143261 is a wasteful number, since it uses less digits than its factorization.

22143261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054451.

The product of its digits is 576, while the sum is 21.

The square root of 22143261 is about 4705.6626525921. The cubic root of 22143261 is about 280.8108342140.

Adding to 22143261 its reverse (16234122), we get a palindrome (38377383).

The spelling of 22143261 in words is "twenty-two million, one hundred forty-three thousand, two hundred sixty-one".