23212811 has 4 divisors (see below), whose sum is σ = 23539824. Its totient is φ = 22885800.

The previous prime is 23212771. The next prime is 23212823. The reversal of 23212811 is 11821232.

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 23212811 - 2¹⁸ = 22950667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23212711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163400 + ... + 163541.

It is an arithmetic number, because the mean of its divisors is an integer number (5884956).

Almost surely, 2^23212811 is an apocalyptic number.

23212811 is a deficient number, since it is larger than the sum of its proper divisors (327013).

23212811 is an equidigital number, since it uses as much as digits as its factorization.

23212811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327012.

The product of its digits is 192, while the sum is 20.

The square root of 23212811 is about 4817.9675175327. The cubic root of 23212811 is about 285.2611170063.

The spelling of 23212811 in words is "twenty-three million, two hundred twelve thousand, eight hundred eleven".