21812234 has 32 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 9900352.

The previous prime is 21812221. The next prime is 21812237. The reversal of 21812234 is 43221812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21812237) 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, 110624 + ... + 110820.

It is an arithmetic number, because the mean of its divisors is an integer number (1122660).

Almost surely, 2^21812234 is an apocalyptic number.

21812234 is a deficient number, since it is larger than the sum of its proper divisors (14112886).

21812234 is a wasteful number, since it uses less digits than its factorization.

21812234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334.

The product of its digits is 768, while the sum is 23.

The square root of 21812234 is about 4670.3569456734. The cubic root of 21812234 is about 279.4044911621.

The spelling of 21812234 in words is "twenty-one million, eight hundred twelve thousand, two hundred thirty-four".