23212139 has 2 divisors, whose sum is σ = 23212140. Its totient is φ = 23212138.

The previous prime is 23212099. The next prime is 23212153. The reversal of 23212139 is 93121232.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23212139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23212169) 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 as a sum of consecutive naturals, namely, 11606069 + 11606070.

It is an arithmetic number, because the mean of its divisors is an integer number (11606070).

Almost surely, 2^23212139 is an apocalyptic number.

23212139 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212139 is an equidigital number, since it uses as much as digits as its factorization.

23212139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 23212139 is about 4817.8977780771. The cubic root of 23212139 is about 285.2583642545.

The spelling of 23212139 in words is "twenty-three million, two hundred twelve thousand, one hundred thirty-nine".