21321221323222 has 16 divisors (see below), whose sum is σ = 32726090022912. Its totient is φ = 10412532141480.

The previous prime is 21321221323189. The next prime is 21321221323247. The reversal of 21321221323222 is 22232312212312.

It is a super-2 number, since 2×21321221323222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3956203 + ... + 7635049.

It is an arithmetic number, because the mean of its divisors is an integer number (2045380626432).

Almost surely, 2^{21321221323222} is an apocalyptic number.

21321221323222 is a deficient number, since it is larger than the sum of its proper divisors (11404868699690).

21321221323222 is a wasteful number, since it uses less digits than its factorization.

21321221323222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746283.

The product of its digits is 6912, while the sum is 28.

Adding to 21321221323222 its reverse (22232312212312), we get a palindrome (43553533535534).

The spelling of 21321221323222 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-two".