21114231 has 4 divisors (see below), whose sum is σ = 28152312. Its totient is φ = 14076152.

The previous prime is 21114229. The next prime is 21114241. The reversal of 21114231 is 13241112.

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 21114231 - 2¹ = 21114229 is a prime.

It is a super-2 number, since 2×21114231² = 891621501442722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21114231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3519036 + ... + 3519041.

It is an arithmetic number, because the mean of its divisors is an integer number (7038078).

Almost surely, 2^21114231 is an apocalyptic number.

21114231 is a deficient number, since it is larger than the sum of its proper divisors (7038081).

21114231 is an equidigital number, since it uses as much as digits as its factorization.

21114231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7038080.

The product of its digits is 48, while the sum is 15.

The square root of 21114231 is about 4595.0224156145. The cubic root of 21114231 is about 276.3917588330.

Adding to 21114231 its reverse (13241112), we get a palindrome (34355343).

The spelling of 21114231 in words is "twenty-one million, one hundred fourteen thousand, two hundred thirty-one".