21887434 has 8 divisors (see below), whose sum is σ = 33090048. Its totient is φ = 10857420.

The previous prime is 21887429. The next prime is 21887447. The reversal of 21887434 is 43478812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21887393 and 21887402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42832 + ... + 43339.

It is an arithmetic number, because the mean of its divisors is an integer number (4136256).

Almost surely, 2^21887434 is an apocalyptic number.

21887434 is a deficient number, since it is larger than the sum of its proper divisors (11202614).

21887434 is a wasteful number, since it uses less digits than its factorization.

21887434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86300.

The product of its digits is 43008, while the sum is 37.

The square root of 21887434 is about 4678.4007951436. The cubic root of 21887434 is about 279.7252151152.

The spelling of 21887434 in words is "twenty-one million, eight hundred eighty-seven thousand, four hundred thirty-four".