211321031 has 2 divisors, whose sum is σ = 211321032. Its totient is φ = 211321030.

The previous prime is 211321009. The next prime is 211321037. The reversal of 211321031 is 130123112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211321031 - 2¹⁴ = 211304647 is a prime.

It is a super-2 number, since 2×211321031² = 89313156285805922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211320997 and 211321015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211321037) 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, 105660515 + 105660516.

It is an arithmetic number, because the mean of its divisors is an integer number (105660516).

Almost surely, 2^211321031 is an apocalyptic number.

211321031 is a deficient number, since it is larger than the sum of its proper divisors (1).

211321031 is an equidigital number, since it uses as much as digits as its factorization.

211321031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 211321031 is about 14536.8851890630. The cubic root of 211321031 is about 595.6359567973.

Adding to 211321031 its reverse (130123112), we get a palindrome (341444143).

The spelling of 211321031 in words is "two hundred eleven million, three hundred twenty-one thousand, thirty-one".