23121201211 has 4 divisors (see below), whose sum is σ = 23121577872. Its totient is φ = 23120824552.

The previous prime is 23121201193. The next prime is 23121201223. The reversal of 23121201211 is 11210212132.

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 23121201211 - 2⁹ = 23121200699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121201811) 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, 72511 + ... + 226936.

It is an arithmetic number, because the mean of its divisors is an integer number (5780394468).

Almost surely, 2^23121201211 is an apocalyptic number.

23121201211 is a deficient number, since it is larger than the sum of its proper divisors (376661).

23121201211 is an equidigital number, since it uses as much as digits as its factorization.

23121201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376660.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 23121201211 its reverse (11210212132), we get a palindrome (34331413343).

The spelling of 23121201211 in words is "twenty-three billion, one hundred twenty-one million, two hundred one thousand, two hundred eleven".