21474244 has 12 divisors (see below), whose sum is σ = 40996368. Its totient is φ = 9761000.

The previous prime is 21474241. The next prime is 21474251. The reversal of 21474244 is 44247412.

It is a super-2 number, since 2×21474244² = 922286310743072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21474241) 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 3 ways as a sum of consecutive naturals, for example, 243982 + ... + 244069.

It is an arithmetic number, because the mean of its divisors is an integer number (3416364).

Almost surely, 2^21474244 is an apocalyptic number.

It is an amenable number.

21474244 is a deficient number, since it is larger than the sum of its proper divisors (19522124).

21474244 is a wasteful number, since it uses less digits than its factorization.

21474244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488066 (or 488064 counting only the distinct ones).

The product of its digits is 7168, while the sum is 28.

The square root of 21474244 is about 4634.0310745613. The cubic root of 21474244 is about 277.9538076901.

The spelling of 21474244 in words is "twenty-one million, four hundred seventy-four thousand, two hundred forty-four".