21125422 has 8 divisors (see below), whose sum is σ = 32225400. Its totient is φ = 10383624.

The previous prime is 21125393. The next prime is 21125443. The reversal of 21125422 is 22452112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21125422.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 89397 + ... + 89632.

It is an arithmetic number, because the mean of its divisors is an integer number (4028175).

Almost surely, 2^21125422 is an apocalyptic number.

21125422 is a deficient number, since it is larger than the sum of its proper divisors (11099978).

21125422 is a wasteful number, since it uses less digits than its factorization.

21125422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179090.

The product of its digits is 320, while the sum is 19.

The square root of 21125422 is about 4596.2399850312. The cubic root of 21125422 is about 276.4405814156.

Adding to 21125422 its reverse (22452112), we get a palindrome (43577534).

The spelling of 21125422 in words is "twenty-one million, one hundred twenty-five thousand, four hundred twenty-two".