21221674 has 8 divisors (see below), whose sum is σ = 31902948. Its totient is φ = 10587360.

The previous prime is 21221671. The next prime is 21221693. The reversal of 21221674 is 47612212.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 126025 = 4593^2 + 355^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21221671) by changing a digit.

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, 10587 + ... + 12430.

Almost surely, 2^21221674 is an apocalyptic number.

21221674 is a deficient number, since it is larger than the sum of its proper divisors (10681274).

21221674 is a wasteful number, since it uses less digits than its factorization.

21221674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23480.

The product of its digits is 1344, while the sum is 25.

The square root of 21221674 is about 4606.6988180258. The cubic root of 21221674 is about 276.8597864581.

Adding to 21221674 its reverse (47612212), we get a palindrome (68833886).

The spelling of 21221674 in words is "twenty-one million, two hundred twenty-one thousand, six hundred seventy-four".