21345834 has 8 divisors (see below), whose sum is σ = 42691680. Its totient is φ = 7115276.

The previous prime is 21345809. The next prime is 21345839. The reversal of 21345834 is 43854312.

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

21345834 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21345839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1778814 + ... + 1778825.

It is an arithmetic number, because the mean of its divisors is an integer number (5336460).

Almost surely, 2^21345834 is an apocalyptic number.

21345834 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21345834 is a wasteful number, since it uses less digits than its factorization.

21345834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557644.

The product of its digits is 11520, while the sum is 30.

The square root of 21345834 is about 4620.1551921986. The cubic root of 21345834 is about 277.3986709013.

The spelling of 21345834 in words is "twenty-one million, three hundred forty-five thousand, eight hundred thirty-four".