21064222 has 4 divisors (see below), whose sum is σ = 31596336. Its totient is φ = 10532110.

The previous prime is 21064193. The next prime is 21064231. The reversal of 21064222 is 22246012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21064222.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5266054 + ... + 5266057.

It is an arithmetic number, because the mean of its divisors is an integer number (7899084).

Almost surely, 2^21064222 is an apocalyptic number.

21064222 is a deficient number, since it is larger than the sum of its proper divisors (10532114).

21064222 is a wasteful number, since it uses less digits than its factorization.

21064222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10532113.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21064222 is about 4589.5775404715. The cubic root of 21064222 is about 276.1733752798.

It can be divided in two parts, 2106 and 4222, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 21064222 in words is "twenty-one million, sixty-four thousand, two hundred twenty-two".