21231320122223 has 4 divisors (see below), whose sum is σ = 21243571318488. Its totient is φ = 21219068925960.

The previous prime is 21231320122189. The next prime is 21231320122283. The reversal of 21231320122223 is 32222102313212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21231320122223 is a prime.

It is a super-2 number, since 2×21231320122223² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231320122192 and 21231320122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231320122283) 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, 6125595533 + ... + 6125598998.

It is an arithmetic number, because the mean of its divisors is an integer number (5310892829622).

Almost surely, 2^{21231320122223} is an apocalyptic number.

21231320122223 is a deficient number, since it is larger than the sum of its proper divisors (12251196265).

21231320122223 is a wasteful number, since it uses less digits than its factorization.

21231320122223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12251196264.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21231320122223 its reverse (32222102313212), we get a palindrome (53453422435435).

The spelling of 21231320122223 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty million, one hundred twenty-two thousand, two hundred twenty-three".