21955446 has 12 divisors (see below), whose sum is σ = 47570172. Its totient is φ = 7318476.

The previous prime is 21955441. The next prime is 21955457. The reversal of 21955446 is 64455912.

21955446 is a `hidden beast` number, since 21 + 95 + 544 + 6 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21955446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21955441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 609856 + ... + 609891.

It is an arithmetic number, because the mean of its divisors is an integer number (3964181).

Almost surely, 2^21955446 is an apocalyptic number.

21955446 is an abundant number, since it is smaller than the sum of its proper divisors (25614726).

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

21955446 is a wasteful number, since it uses less digits than its factorization.

21955446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219755 (or 1219752 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 21955446 is about 4685.6638803909. The cubic root of 21955446 is about 280.0146505940.

The spelling of 21955446 in words is "twenty-one million, nine hundred fifty-five thousand, four hundred forty-six".