21321123222 has 32 divisors (see below), whose sum is σ = 48749271552. Its totient is φ = 6089840064.

The previous prime is 21321123217. The next prime is 21321123253. The reversal of 21321123222 is 22232112312.

It is a super-2 number, since 2×21321123222² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58863 + ... + 214725.

It is an arithmetic number, because the mean of its divisors is an integer number (1523414736).

Almost surely, 2^21321123222 is an apocalyptic number.

21321123222 is an abundant number, since it is smaller than the sum of its proper divisors (27428148330).

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

21321123222 is a wasteful number, since it uses less digits than its factorization.

21321123222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159132.

The product of its digits is 576, while the sum is 21.

Adding to 21321123222 its reverse (22232112312), we get a palindrome (43553235534).

The spelling of 21321123222 in words is "twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-two".