21683422 has 4 divisors (see below), whose sum is σ = 32525136. Its totient is φ = 10841710.

The previous prime is 21683419. The next prime is 21683429. The reversal of 21683422 is 22438612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5420854 + ... + 5420857.

It is an arithmetic number, because the mean of its divisors is an integer number (8131284).

Almost surely, 2^21683422 is an apocalyptic number.

21683422 is a deficient number, since it is larger than the sum of its proper divisors (10841714).

21683422 is a wasteful number, since it uses less digits than its factorization.

21683422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10841713.

The product of its digits is 4608, while the sum is 28.

The square root of 21683422 is about 4656.5461449448. The cubic root of 21683422 is about 278.8533977988.

It can be divided in two parts, 216 and 83422, that added together give a palindrome (83638).

The spelling of 21683422 in words is "twenty-one million, six hundred eighty-three thousand, four hundred twenty-two".