21848231 has 8 divisors (see below), whose sum is σ = 22554240. Its totient is φ = 21153528.

The previous prime is 21848221. The next prime is 21848249. The reversal of 21848231 is 13284812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21848231 is a prime.

It is a super-2 number, since 2×21848231² = 954690395658722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21848194 and 21848203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848221) 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, 1190 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (2819280).

Almost surely, 2^21848231 is an apocalyptic number.

21848231 is a deficient number, since it is larger than the sum of its proper divisors (706009).

21848231 is an equidigital number, since it uses as much as digits as its factorization.

21848231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653.

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

The square root of 21848231 is about 4674.2091309654. The cubic root of 21848231 is about 279.5581082521.

The spelling of 21848231 in words is "twenty-one million, eight hundred forty-eight thousand, two hundred thirty-one".