21354234 has 16 divisors (see below), whose sum is σ = 46591200. Its totient is φ = 6470960.

The previous prime is 21354197. The next prime is 21354241. The reversal of 21354234 is 43245312.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161709 + ... + 161840.

It is an arithmetic number, because the mean of its divisors is an integer number (2911950).

Almost surely, 2^21354234 is an apocalyptic number.

21354234 is an abundant number, since it is smaller than the sum of its proper divisors (25236966).

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

21354234 is a wasteful number, since it uses less digits than its factorization.

21354234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323565.

The product of its digits is 2880, while the sum is 24.

The square root of 21354234 is about 4621.0641631555. The cubic root of 21354234 is about 277.4350533831.

Adding to 21354234 its reverse (43245312), we get a palindrome (64599546).

The spelling of 21354234 in words is "twenty-one million, three hundred fifty-four thousand, two hundred thirty-four".