21311422 has 16 divisors (see below), whose sum is σ = 35046144. Its totient is φ = 9639000.

The previous prime is 21311417. The next prime is 21311429. The reversal of 21311422 is 22411312.

It is a junction number, because it is equal to n+sod(n) for n = 21311396 and 21311405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2347 + ... + 6937.

It is an arithmetic number, because the mean of its divisors is an integer number (2190384).

Almost surely, 2^21311422 is an apocalyptic number.

21311422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21311422 is a deficient number, since it is larger than the sum of its proper divisors (13734722).

21311422 is a wasteful number, since it uses less digits than its factorization.

21311422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4815.

The product of its digits is 96, while the sum is 16.

The square root of 21311422 is about 4616.4295727326. The cubic root of 21311422 is about 277.2495242757.

Adding to 21311422 its reverse (22411312), we get a palindrome (43722734).

It can be divided in two parts, 2131 and 1422, that added together give a palindrome (3553).

The spelling of 21311422 in words is "twenty-one million, three hundred eleven thousand, four hundred twenty-two".