211231051 has 2 divisors, whose sum is σ = 211231052. Its totient is φ = 211231050.

The previous prime is 211231049. The next prime is 211231063. The reversal of 211231051 is 150132112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211231051 - 2¹ = 211231049 is a prime.

Together with 211231049, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211231091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615525 + 105615526.

It is an arithmetic number, because the mean of its divisors is an integer number (105615526).

Almost surely, 2^211231051 is an apocalyptic number.

211231051 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231051 is an equidigital number, since it uses as much as digits as its factorization.

211231051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 211231051 is about 14533.7899737130. The cubic root of 211231051 is about 595.5514046638.

Adding to 211231051 its reverse (150132112), we get a palindrome (361363163).

The spelling of 211231051 in words is "two hundred eleven million, two hundred thirty-one thousand, fifty-one".