21014218 has 16 divisors (see below), whose sum is σ = 32990976. Its totient is φ = 10026720.

The previous prime is 21014179. The next prime is 21014233. The reversal of 21014218 is 81241012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21014195 and 21014204.

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, 2205 + ... + 6847.

It is an arithmetic number, because the mean of its divisors is an integer number (2061936).

Almost surely, 2^21014218 is an apocalyptic number.

21014218 is a deficient number, since it is larger than the sum of its proper divisors (11976758).

21014218 is a wasteful number, since it uses less digits than its factorization.

21014218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4749.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21014218 is about 4584.1267434485. The cubic root of 21014218 is about 275.9546676930.

The spelling of 21014218 in words is "twenty-one million, fourteen thousand, two hundred eighteen".