21222946 has 8 divisors (see below), whose sum is σ = 32037660. Its totient is φ = 10543728.

The previous prime is 21222931. The next prime is 21222959. The reversal of 21222946 is 64922212.

It can be written as a sum of positive squares in 2 ways, for example, as 21058921 + 164025 = 4589^2 + 405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 33481 + ... + 34108.

Almost surely, 2^21222946 is an apocalyptic number.

21222946 is a deficient number, since it is larger than the sum of its proper divisors (10814714).

21222946 is a wasteful number, since it uses less digits than its factorization.

21222946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67748.

The product of its digits is 3456, while the sum is 28.

The square root of 21222946 is about 4606.8368757750. The cubic root of 21222946 is about 276.8653178881.

The spelling of 21222946 in words is "twenty-one million, two hundred twenty-two thousand, nine hundred forty-six".