23213011211221 has 4 divisors (see below), whose sum is σ = 24998627458252. Its totient is φ = 21427394964192.

The previous prime is 23213011211183. The next prime is 23213011211231. The reversal of 23213011211221 is 12211211031232.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8011667979121 + 15201343232100 = 2830489^2 + 3898890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23213011211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23213011211192 and 23213011211201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213011211231) by changing a digit.

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, 892808123496 + ... + 892808123521.

It is an arithmetic number, because the mean of its divisors is an integer number (6249656864563).

Almost surely, 2^{23213011211221} is an apocalyptic number.

It is an amenable number.

23213011211221 is a deficient number, since it is larger than the sum of its proper divisors (1785616247031).

23213011211221 is a wasteful number, since it uses less digits than its factorization.

23213011211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785616247030.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 23213011211221 its reverse (12211211031232), we get a palindrome (35424222242453).

The spelling of 23213011211221 in words is "twenty-three trillion, two hundred thirteen billion, eleven million, two hundred eleven thousand, two hundred twenty-one".