21914745 has 16 divisors (see below), whose sum is σ = 36588672. Its totient is φ = 11179520.

The previous prime is 21914743. The next prime is 21914759. The reversal of 21914745 is 54741912.

It is a happy number.

It is not a de Polignac number, because 21914745 - 2¹ = 21914743 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21914741) 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 15 ways as a sum of consecutive naturals, for example, 31416 + ... + 32105.

It is an arithmetic number, because the mean of its divisors is an integer number (2286792).

Almost surely, 2^21914745 is an apocalyptic number.

It is an amenable number.

21914745 is a deficient number, since it is larger than the sum of its proper divisors (14673927).

21914745 is a wasteful number, since it uses less digits than its factorization.

21914745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63552.

The product of its digits is 10080, while the sum is 33.

The square root of 21914745 is about 4681.3187244622. The cubic root of 21914745 is about 279.8415132007.

The spelling of 21914745 in words is "twenty-one million, nine hundred fourteen thousand, seven hundred forty-five".