212771866 has 8 divisors (see below), whose sum is σ = 319477140. Its totient is φ = 106279488.

The previous prime is 212771849. The next prime is 212771891. The reversal of 212771866 is 668177212.

It can be written as a sum of positive squares in 2 ways, for example, as 181467841 + 31304025 = 13471^2 + 5595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×212771866² = 90543733922243912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50701 + ... + 54736.

Almost surely, 2^212771866 is an apocalyptic number.

212771866 is a deficient number, since it is larger than the sum of its proper divisors (106705274).

212771866 is a wasteful number, since it uses less digits than its factorization.

212771866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106448.

The product of its digits is 56448, while the sum is 40.

The square root of 212771866 is about 14586.7016833827. The cubic root of 212771866 is about 596.9959718291.

The spelling of 212771866 in words is "two hundred twelve million, seven hundred seventy-one thousand, eight hundred sixty-six".