212205031 has 4 divisors (see below), whose sum is σ = 215683864. Its totient is φ = 208726200.

The previous prime is 212205023. The next prime is 212205109. The reversal of 212205031 is 130502212.

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 212205031 - 2³ = 212205023 is a prime.

It is a super-2 number, since 2×212205031² = 90061950363421922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212204996 and 212205014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212205131) 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, 1739325 + ... + 1739446.

It is an arithmetic number, because the mean of its divisors is an integer number (53920966).

Almost surely, 2^212205031 is an apocalyptic number.

212205031 is a deficient number, since it is larger than the sum of its proper divisors (3478833).

212205031 is an equidigital number, since it uses as much as digits as its factorization.

212205031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478832.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 212205031 is about 14567.2588704945. The cubic root of 212205031 is about 596.4653578795.

Adding to 212205031 its reverse (130502212), we get a palindrome (342707243).

The spelling of 212205031 in words is "two hundred twelve million, two hundred five thousand, thirty-one".