21223996 has 6 divisors (see below), whose sum is σ = 37142000. Its totient is φ = 10611996.

The previous prime is 21223981. The next prime is 21223997. The reversal of 21223996 is 69932212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223997) 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 as a sum of consecutive naturals, namely, 2652996 + ... + 2653003.

Almost surely, 2^21223996 is an apocalyptic number.

It is an amenable number.

21223996 is a deficient number, since it is larger than the sum of its proper divisors (15918004).

21223996 is a wasteful number, since it uses less digits than its factorization.

21223996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306003 (or 5306001 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 21223996 is about 4606.9508354225. The cubic root of 21223996 is about 276.8698837605.

The spelling of 21223996 in words is "twenty-one million, two hundred twenty-three thousand, nine hundred ninety-six".