211231203031 has 2 divisors, whose sum is σ = 211231203032. Its totient is φ = 211231203030.

The previous prime is 211231203017. The next prime is 211231203047. The reversal of 211231203031 is 130302132112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211231203031 - 2⁹ = 211231202519 is a prime.

It is a super-2 number, since 2×211231203031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211231206031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615601515 + 105615601516.

It is an arithmetic number, because the mean of its divisors is an integer number (105615601516).

Almost surely, 2^211231203031 is an apocalyptic number.

211231203031 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231203031 is an equidigital number, since it uses as much as digits as its factorization.

211231203031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211231203031 its reverse (130302132112), we get a palindrome (341533335143).

The spelling of 211231203031 in words is "two hundred eleven billion, two hundred thirty-one million, two hundred three thousand, thirty-one".