21274234 has 8 divisors (see below), whose sum is σ = 32240628. Its totient is φ = 10527360.

The previous prime is 21274219. The next prime is 21274237. The reversal of 21274234 is 43247212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18948609 + 2325625 = 4353^2 + 1525^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21274199 and 21274208.

It is not an unprimeable number, because it can be changed into a prime (21274237) 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, 54637 + ... + 55024.

Almost surely, 2^21274234 is an apocalyptic number.

21274234 is a deficient number, since it is larger than the sum of its proper divisors (10966394).

21274234 is a wasteful number, since it uses less digits than its factorization.

21274234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109760.

The product of its digits is 2688, while the sum is 25.

The square root of 21274234 is about 4612.4000260168. The cubic root of 21274234 is about 277.0881654474.

The spelling of 21274234 in words is "twenty-one million, two hundred seventy-four thousand, two hundred thirty-four".