203212811 has 2 divisors, whose sum is σ = 203212812. Its totient is φ = 203212810.

The previous prime is 203212783. The next prime is 203212813. The reversal of 203212811 is 118212302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203212811 is a prime.

Together with 203212813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (203212813) 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, 101606405 + 101606406.

It is an arithmetic number, because the mean of its divisors is an integer number (101606406).

Almost surely, 2^203212811 is an apocalyptic number.

203212811 is a deficient number, since it is larger than the sum of its proper divisors (1).

203212811 is an equidigital number, since it uses as much as digits as its factorization.

203212811 is an odious number, because the sum of its binary digits is odd.

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

The square root of 203212811 is about 14255.2730945429. The cubic root of 203212811 is about 587.9183666193.

It can be divided in two parts, 20321 and 2811, that added together give a palindrome (23132).

The spelling of 203212811 in words is "two hundred three million, two hundred twelve thousand, eight hundred eleven".