21223110312311 has 4 divisors (see below), whose sum is σ = 21230361121632. Its totient is φ = 21215859502992.

The previous prime is 21223110312307. The next prime is 21223110312323. The reversal of 21223110312311 is 11321301132212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21223110312311 - 2² = 21223110312307 is a prime.

It is a super-2 number, since 2×21223110312311² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223110312301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3625400270 + ... + 3625406123.

It is an arithmetic number, because the mean of its divisors is an integer number (5307590280408).

Almost surely, 2^{21223110312311} is an apocalyptic number.

21223110312311 is a deficient number, since it is larger than the sum of its proper divisors (7250809321).

21223110312311 is an equidigital number, since it uses as much as digits as its factorization.

21223110312311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7250809320.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21223110312311 its reverse (11321301132212), we get a palindrome (32544411444523).

The spelling of 21223110312311 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred ten million, three hundred twelve thousand, three hundred eleven".