21249214 has 16 divisors (see below), whose sum is σ = 36540000. Its totient is φ = 9078624.

The previous prime is 21249203. The next prime is 21249253. The reversal of 21249214 is 41294212.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2712 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (2283750).

Almost surely, 2^21249214 is an apocalyptic number.

21249214 is a deficient number, since it is larger than the sum of its proper divisors (15290786).

21249214 is a wasteful number, since it uses less digits than its factorization.

21249214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707.

The product of its digits is 1152, while the sum is 25.

The square root of 21249214 is about 4609.6869741882. The cubic root of 21249214 is about 276.9794977592.

The spelling of 21249214 in words is "twenty-one million, two hundred forty-nine thousand, two hundred fourteen".