21941231 has 8 divisors (see below), whose sum is σ = 23665824. Its totient is φ = 20221920.

The previous prime is 21941207. The next prime is 21941233. The reversal of 21941231 is 13214912.

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-21941231 is a prime.

It is a super-2 number, since 2×21941231² = 962835235590722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21941197 and 21941206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13766 + ... + 15276.

It is an arithmetic number, because the mean of its divisors is an integer number (2958228).

Almost surely, 2^21941231 is an apocalyptic number.

21941231 is a deficient number, since it is larger than the sum of its proper divisors (1724593).

21941231 is a wasteful number, since it uses less digits than its factorization.

21941231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641.

The product of its digits is 432, while the sum is 23.

The square root of 21941231 is about 4684.1467739600. The cubic root of 21941231 is about 279.9542059462.

The spelling of 21941231 in words is "twenty-one million, nine hundred forty-one thousand, two hundred thirty-one".