21311221422 has 8 divisors (see below), whose sum is σ = 42622442856. Its totient is φ = 7103740472.

The previous prime is 21311221397. The next prime is 21311221441. The reversal of 21311221422 is 22412211312.

It is a happy number.

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

21311221422 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1775935113 + ... + 1775935124.

It is an arithmetic number, because the mean of its divisors is an integer number (5327805357).

Almost surely, 2^21311221422 is an apocalyptic number.

21311221422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311221422 is a wasteful number, since it uses less digits than its factorization.

21311221422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551870242.

The product of its digits is 384, while the sum is 21.

Adding to 21311221422 its reverse (22412211312), we get a palindrome (43723432734).

The spelling of 21311221422 in words is "twenty-one billion, three hundred eleven million, two hundred twenty-one thousand, four hundred twenty-two".