21233143 has 8 divisors (see below), whose sum is σ = 21950208. Its totient is φ = 20527224.

The previous prime is 21233131. The next prime is 21233161. The reversal of 21233143 is 34133212.

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 21233143 - 2⁵ = 21233111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21233143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233123) 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, 1180 + ... + 6622.

It is an arithmetic number, because the mean of its divisors is an integer number (2743776).

Almost surely, 2^21233143 is an apocalyptic number.

21233143 is a deficient number, since it is larger than the sum of its proper divisors (717065).

21233143 is an equidigital number, since it uses as much as digits as its factorization.

21233143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573.

The product of its digits is 432, while the sum is 19.

The square root of 21233143 is about 4607.9434675352. The cubic root of 21233143 is about 276.9096526632.

Adding to 21233143 its reverse (34133212), we get a palindrome (55366355).

The spelling of 21233143 in words is "twenty-one million, two hundred thirty-three thousand, one hundred forty-three".