212211971 has 4 divisors (see below), whose sum is σ = 215200944. Its totient is φ = 209223000.

The previous prime is 212211953. The next prime is 212211997. The reversal of 212211971 is 179112212.

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 212211971 - 2⁶ = 212211907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212211971.

It is not an unprimeable number, because it can be changed into a prime (212211911) 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 in 3 ways as a sum of consecutive naturals, for example, 1494380 + ... + 1494521.

It is an arithmetic number, because the mean of its divisors is an integer number (53800236).

Almost surely, 2^212211971 is an apocalyptic number.

212211971 is a deficient number, since it is larger than the sum of its proper divisors (2988973).

212211971 is an equidigital number, since it uses as much as digits as its factorization.

212211971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988972.

The product of its digits is 504, while the sum is 26.

The square root of 212211971 is about 14567.4970739657. The cubic root of 212211971 is about 596.4718601201.

The spelling of 212211971 in words is "two hundred twelve million, two hundred eleven thousand, nine hundred seventy-one".