21446231 has 16 divisors (see below), whose sum is σ = 24284160. Its totient is φ = 18817920.

The previous prime is 21446221. The next prime is 21446233. The reversal of 21446231 is 13264412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21446231 is a prime.

It is a super-2 number, since 2×21446231² = 919881648210722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21446197 and 21446206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21146 + ... + 22136.

It is an arithmetic number, because the mean of its divisors is an integer number (1517760).

Almost surely, 2^21446231 is an apocalyptic number.

21446231 is a deficient number, since it is larger than the sum of its proper divisors (2837929).

21446231 is a wasteful number, since it uses less digits than its factorization.

21446231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its digits is 1152, while the sum is 23.

The square root of 21446231 is about 4631.0075577567. The cubic root of 21446231 is about 277.8328921691.

The spelling of 21446231 in words is "twenty-one million, four hundred forty-six thousand, two hundred thirty-one".