212077121566 has 32 divisors (see below), whose sum is σ = 340394648832. Its totient is φ = 98744893440.

The previous prime is 212077121513. The next prime is 212077121579. The reversal of 212077121566 is 665121770212.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 16770606 + ... + 16783246.

It is an arithmetic number, because the mean of its divisors is an integer number (10637332776).

Almost surely, 2^212077121566 is an apocalyptic number.

212077121566 is a deficient number, since it is larger than the sum of its proper divisors (128317527266).

212077121566 is a wasteful number, since it uses less digits than its factorization.

212077121566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17844.

The product of its (nonzero) digits is 70560, while the sum is 40.

Adding to 212077121566 its reverse (665121770212), we get a palindrome (877198891778).

The spelling of 212077121566 in words is "two hundred twelve billion, seventy-seven million, one hundred twenty-one thousand, five hundred sixty-six".