21982434 has 16 divisors (see below), whose sum is σ = 45876672. Its totient is φ = 7008848.

The previous prime is 21982427. The next prime is 21982451. The reversal of 21982434 is 43428912.

It is a junction number, because it is equal to n+sod(n) for n = 21982395 and 21982404.

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, 79509 + ... + 79784.

It is an arithmetic number, because the mean of its divisors is an integer number (2867292).

Almost surely, 2^21982434 is an apocalyptic number.

21982434 is an abundant number, since it is smaller than the sum of its proper divisors (23894238).

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

21982434 is a wasteful number, since it uses less digits than its factorization.

21982434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159321.

The product of its digits is 13824, while the sum is 33.

The square root of 21982434 is about 4688.5428439975. The cubic root of 21982434 is about 280.1293365067.

The spelling of 21982434 in words is "twenty-one million, nine hundred eighty-two thousand, four hundred thirty-four".