21297234 has 16 divisors (see below), whose sum is σ = 48679488. Its totient is φ = 6084912.

The previous prime is 21297203. The next prime is 21297247. The reversal of 21297234 is 43279212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253497 + ... + 253580.

It is an arithmetic number, because the mean of its divisors is an integer number (3042468).

Almost surely, 2^21297234 is an apocalyptic number.

21297234 is an abundant number, since it is smaller than the sum of its proper divisors (27382254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21297234 is a wasteful number, since it uses less digits than its factorization.

21297234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507089.

The product of its digits is 6048, while the sum is 30.

The square root of 21297234 is about 4614.8926314704. The cubic root of 21297234 is about 277.1879846702.

The spelling of 21297234 in words is "twenty-one million, two hundred ninety-seven thousand, two hundred thirty-four".