21882143 has 4 divisors (see below), whose sum is σ = 21952368. Its totient is φ = 21811920.

The previous prime is 21882139. The next prime is 21882149. The reversal of 21882143 is 34128812.

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 21882143 - 2² = 21882139 is a prime.

It is a super-3 number, since 3×21882143³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21882149) 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, 34643 + ... + 35268.

It is an arithmetic number, because the mean of its divisors is an integer number (5488092).

Almost surely, 2^21882143 is an apocalyptic number.

21882143 is a deficient number, since it is larger than the sum of its proper divisors (70225).

21882143 is an equidigital number, since it uses as much as digits as its factorization.

21882143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70224.

The product of its digits is 3072, while the sum is 29.

The square root of 21882143 is about 4677.8352899605. The cubic root of 21882143 is about 279.7026733318.

The spelling of 21882143 in words is "twenty-one million, eight hundred eighty-two thousand, one hundred forty-three".