23211221 has 8 divisors (see below), whose sum is σ = 25370688. Its totient is φ = 21060000.

The previous prime is 23211169. The next prime is 23211229. The reversal of 23211221 is 12211232.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23211221 - 2¹⁴ = 23194837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23211196 and 23211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23211229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4856 + ... + 8366.

It is an arithmetic number, because the mean of its divisors is an integer number (3171336).

Almost surely, 2^23211221 is an apocalyptic number.

It is an amenable number.

23211221 is a deficient number, since it is larger than the sum of its proper divisors (2159467).

23211221 is a wasteful number, since it uses less digits than its factorization.

23211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123.

The product of its digits is 48, while the sum is 14.

The square root of 23211221 is about 4817.8025073679. The cubic root of 23211221 is about 285.2546037131.

Adding to 23211221 its reverse (12211232), we get a palindrome (35422453).

It can be divided in two parts, 23211 and 221, that added together give a palindrome (23432).

The spelling of 23211221 in words is "twenty-three million, two hundred eleven thousand, two hundred twenty-one".