21422249 has 8 divisors (see below), whose sum is σ = 21745152. Its totient is φ = 21101760.

The previous prime is 21422231. The next prime is 21422273. The reversal of 21422249 is 94222412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21422249 - 2²⁰ = 20373673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21422449) 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 7 ways as a sum of consecutive naturals, for example, 24392 + ... + 25254.

It is an arithmetic number, because the mean of its divisors is an integer number (2718144).

Almost surely, 2^21422249 is an apocalyptic number.

It is an amenable number.

21422249 is a deficient number, since it is larger than the sum of its proper divisors (322903).

21422249 is a wasteful number, since it uses less digits than its factorization.

21422249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207.

The product of its digits is 2304, while the sum is 26.

The square root of 21422249 is about 4628.4175481475. The cubic root of 21422249 is about 277.7292924027.

The spelling of 21422249 in words is "twenty-one million, four hundred twenty-two thousand, two hundred forty-nine".