212072771 has 4 divisors (see below), whose sum is σ = 212151600. Its totient is φ = 211993944.

The previous prime is 212072761. The next prime is 212072779. The reversal of 212072771 is 177270212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212072771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212072779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35231 + ... + 40808.

It is an arithmetic number, because the mean of its divisors is an integer number (53037900).

Almost surely, 2^212072771 is an apocalyptic number.

212072771 is a deficient number, since it is larger than the sum of its proper divisors (78829).

212072771 is an equidigital number, since it uses as much as digits as its factorization.

212072771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78828.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 212072771 is about 14562.7185305492. The cubic root of 212072771 is about 596.3414134361.

The spelling of 212072771 in words is "two hundred twelve million, seventy-two thousand, seven hundred seventy-one".