21245422 has 32 divisors (see below), whose sum is σ = 36681984. Its totient is φ = 9210520.

The previous prime is 21245417. The next prime is 21245459. The reversal of 21245422 is 22454212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a pancake number, because a pancake can be divided into 21245422 parts by 6518 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 21245393 and 21245402.

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 15 ways as a sum of consecutive naturals, for example, 61053 + ... + 61399.

It is an arithmetic number, because the mean of its divisors is an integer number (1146312).

Almost surely, 2^21245422 is an apocalyptic number.

21245422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21245422 is a deficient number, since it is larger than the sum of its proper divisors (15436562).

21245422 is a wasteful number, since it uses less digits than its factorization.

21245422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 383 counting only the distinct ones).

The product of its digits is 1280, while the sum is 22.

The square root of 21245422 is about 4609.2756480818. The cubic root of 21245422 is about 276.9630207774.

Adding to 21245422 its reverse (22454212), we get a palindrome (43699634).

The spelling of 21245422 in words is "twenty-one million, two hundred forty-five thousand, four hundred twenty-two".