21355214 has 4 divisors (see below), whose sum is σ = 32032824. Its totient is φ = 10677606.

The previous prime is 21355207. The next prime is 21355231. The reversal of 21355214 is 41255312.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21355214.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338802 + ... + 5338805.

It is an arithmetic number, because the mean of its divisors is an integer number (8008206).

Almost surely, 2^21355214 is an apocalyptic number.

21355214 is a deficient number, since it is larger than the sum of its proper divisors (10677610).

21355214 is a wasteful number, since it uses less digits than its factorization.

21355214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677609.

The product of its digits is 1200, while the sum is 23.

The square root of 21355214 is about 4621.1701981208. The cubic root of 21355214 is about 277.4392973844.

The spelling of 21355214 in words is "twenty-one million, three hundred fifty-five thousand, two hundred fourteen".