211212031 has 4 divisors (see below), whose sum is σ = 215705952. Its totient is φ = 206718112.

The previous prime is 211212019. The next prime is 211212091. The reversal of 211212031 is 130212112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211212031 - 2²¹ = 209114879 is a prime.

It is a super-2 number, since 2×211212031² = 89221044078289922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246890 + ... + 2246983.

It is an arithmetic number, because the mean of its divisors is an integer number (53926488).

Almost surely, 2^211212031 is an apocalyptic number.

211212031 is a deficient number, since it is larger than the sum of its proper divisors (4493921).

211212031 is an equidigital number, since it uses as much as digits as its factorization.

211212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493920.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 211212031 is about 14533.1356217438. The cubic root of 211212031 is about 595.5335289337.

Adding to 211212031 its reverse (130212112), we get a palindrome (341424143).

The spelling of 211212031 in words is "two hundred eleven million, two hundred twelve thousand, thirty-one".