21874434 has 24 divisors (see below), whose sum is σ = 46177200. Its totient is φ = 6907032.

The previous prime is 21874421. The next prime is 21874451. The reversal of 21874434 is 43447812.

It is a junction number, because it is equal to n+sod(n) for n = 21874395 and 21874404.

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 11 ways as a sum of consecutive naturals, for example, 2884 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (1924050).

Almost surely, 2^21874434 is an apocalyptic number.

21874434 is an abundant number, since it is smaller than the sum of its proper divisors (24302766).

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

21874434 is a wasteful number, since it uses less digits than its factorization.

21874434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10142 (or 10123 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 21874434 is about 4677.0112251309. The cubic root of 21874434 is about 279.6698233931.

The spelling of 21874434 in words is "twenty-one million, eight hundred seventy-four thousand, four hundred thirty-four".