21922417 has 12 divisors (see below), whose sum is σ = 24344320. Its totient is φ = 19724760.

The previous prime is 21922379. The next prime is 21922423. The reversal of 21922417 is 71422912.

21922417 = 799² + 800² + ... + 831².

It is not a de Polignac number, because 21922417 - 2²³ = 13533809 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21922517) 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 11 ways as a sum of consecutive naturals, for example, 11584 + ... + 13342.

Almost surely, 2^21922417 is an apocalyptic number.

It is an amenable number.

21922417 is a deficient number, since it is larger than the sum of its proper divisors (2421903).

21922417 is a wasteful number, since it uses less digits than its factorization.

21922417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884 (or 1873 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 21922417 is about 4682.1380799801. The cubic root of 21922417 is about 279.8741653960.

The spelling of 21922417 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred seventeen".