21422583 has 32 divisors (see below), whose sum is σ = 39065600. Its totient is φ = 11298528.

The previous prime is 21422579. The next prime is 21422587. The reversal of 21422583 is 38522412.

It is an interprime number because it is at equal distance from previous prime (21422579) and next prime (21422587).

It is not a de Polignac number, because 21422583 - 2² = 21422579 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1903 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (1220800).

Almost surely, 2^21422583 is an apocalyptic number.

21422583 is a deficient number, since it is larger than the sum of its proper divisors (17643017).

21422583 is a wasteful number, since it uses less digits than its factorization.

21422583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8748 (or 8742 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21422583 is about 4628.4536294534. The cubic root of 21422583 is about 277.7307357790.

Adding to 21422583 its reverse (38522412), we get a palindrome (59944995).

The spelling of 21422583 in words is "twenty-one million, four hundred twenty-two thousand, five hundred eighty-three".