21884147 has 4 divisors (see below), whose sum is σ = 21908880. Its totient is φ = 21859416.

The previous prime is 21884141. The next prime is 21884153. The reversal of 21884147 is 74148812.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21884141) and next prime (21884153).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21884147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21884141) 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, 10988 + ... + 12825.

It is an arithmetic number, because the mean of its divisors is an integer number (5477220).

Almost surely, 2^21884147 is an apocalyptic number.

21884147 is a deficient number, since it is larger than the sum of its proper divisors (24733).

21884147 is an equidigital number, since it uses as much as digits as its factorization.

21884147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24732.

The product of its digits is 14336, while the sum is 35.

The square root of 21884147 is about 4678.0494866985. The cubic root of 21884147 is about 279.7112116035.

The spelling of 21884147 in words is "twenty-one million, eight hundred eighty-four thousand, one hundred forty-seven".