21229974 has 24 divisors (see below), whose sum is σ = 48704760. Its totient is φ = 6660288.

The previous prime is 21229961. The next prime is 21229979. The reversal of 21229974 is 47992212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21229979) 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 11 ways as a sum of consecutive naturals, for example, 34384 + ... + 34995.

It is an arithmetic number, because the mean of its divisors is an integer number (2029365).

Almost surely, 2^21229974 is an apocalyptic number.

21229974 is an abundant number, since it is smaller than the sum of its proper divisors (27474786).

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

21229974 is a wasteful number, since it uses less digits than its factorization.

21229974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69404 (or 69401 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21229974 is about 4607.5995919785. The cubic root of 21229974 is about 276.8958759251.

The spelling of 21229974 in words is "twenty-one million, two hundred twenty-nine thousand, nine hundred seventy-four".