21910434 has 32 divisors (see below), whose sum is σ = 53934720. Its totient is φ = 5778432.

The previous prime is 21910409. The next prime is 21910453. The reversal of 21910434 is 43401912.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19519 + ... + 20610.

It is an arithmetic number, because the mean of its divisors is an integer number (1685460).

Almost surely, 2^21910434 is an apocalyptic number.

21910434 is an abundant number, since it is smaller than the sum of its proper divisors (32024286).

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

21910434 is a wasteful number, since it uses less digits than its factorization.

21910434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40154.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21910434 is about 4680.8582546366. The cubic root of 21910434 is about 279.8231621487.

The spelling of 21910434 in words is "twenty-one million, nine hundred ten thousand, four hundred thirty-four".