21941284 has 12 divisors (see below), whose sum is σ = 39721500. Its totient is φ = 10592288.

The previous prime is 21941279. The next prime is 21941291. The reversal of 21941284 is 48214912.

It can be written as a sum of positive squares in 2 ways, for example, as 10381284 + 11560000 = 3222^2 + 3400^2 .

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, 94459 + ... + 94690.

It is an arithmetic number, because the mean of its divisors is an integer number (3310125).

Almost surely, 2^21941284 is an apocalyptic number.

It is an amenable number.

21941284 is a deficient number, since it is larger than the sum of its proper divisors (17780216).

21941284 is a wasteful number, since it uses less digits than its factorization.

21941284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189182 (or 189180 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 21941284 is about 4684.1524313370. The cubic root of 21941284 is about 279.9544313598.

The spelling of 21941284 in words is "twenty-one million, nine hundred forty-one thousand, two hundred eighty-four".