21171422 has 8 divisors (see below), whose sum is σ = 31854072. Its totient is φ = 10553400.

The previous prime is 21171407. The next prime is 21171461. The reversal of 21171422 is 22417112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21171394 and 21171403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15329 + ... + 16652.

It is an arithmetic number, because the mean of its divisors is an integer number (3981759).

Almost surely, 2^21171422 is an apocalyptic number.

21171422 is a deficient number, since it is larger than the sum of its proper divisors (10682650).

21171422 is a wasteful number, since it uses less digits than its factorization.

21171422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32314.

The product of its digits is 224, while the sum is 20.

The square root of 21171422 is about 4601.2413542434. The cubic root of 21171422 is about 276.6410831007.

Adding to 21171422 its reverse (22417112), we get a palindrome (43588534).

The spelling of 21171422 in words is "twenty-one million, one hundred seventy-one thousand, four hundred twenty-two".