21342018 has 16 divisors (see below), whose sum is σ = 43677216. Its totient is φ = 6948480.

The previous prime is 21342001. The next prime is 21342023. The reversal of 21342018 is 81024312.

It is a junction number, because it is equal to n+sod(n) for n = 21341985 and 21342003.

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 7 ways as a sum of consecutive naturals, for example, 41103 + ... + 41618.

It is an arithmetic number, because the mean of its divisors is an integer number (2729826).

Almost surely, 2^21342018 is an apocalyptic number.

21342018 is an abundant number, since it is smaller than the sum of its proper divisors (22335198).

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

21342018 is a wasteful number, since it uses less digits than its factorization.

21342018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82769.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21342018 is about 4619.7422005995. The cubic root of 21342018 is about 277.3821397066.

The spelling of 21342018 in words is "twenty-one million, three hundred forty-two thousand, eighteen".