21185422 has 8 divisors (see below), whose sum is σ = 32299272. Its totient is φ = 10419000.

The previous prime is 21185419. The next prime is 21185441. The reversal of 21185422 is 22458112.

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

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, 86704 + ... + 86947.

It is an arithmetic number, because the mean of its divisors is an integer number (4037409).

Almost surely, 2^21185422 is an apocalyptic number.

21185422 is a deficient number, since it is larger than the sum of its proper divisors (11113850).

21185422 is a wasteful number, since it uses less digits than its factorization.

21185422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173714.

The product of its digits is 1280, while the sum is 25.

The square root of 21185422 is about 4602.7624314101. The cubic root of 21185422 is about 276.7020477001.

The spelling of 21185422 in words is "twenty-one million, one hundred eighty-five thousand, four hundred twenty-two".