212666506 has 16 divisors (see below), whose sum is σ = 361620000. Its totient is φ = 92987568.

The previous prime is 212666423. The next prime is 212666537. The reversal of 212666506 is 605666212.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 214756 + ... + 215743.

It is an arithmetic number, because the mean of its divisors is an integer number (22601250).

Almost surely, 2^212666506 is an apocalyptic number.

212666506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

212666506 is a deficient number, since it is larger than the sum of its proper divisors (148953494).

212666506 is a wasteful number, since it uses less digits than its factorization.

212666506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430533.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 212666506 is about 14583.0897274892. The cubic root of 212666506 is about 596.8974157531.

It can be divided in two parts, 21266 and 6506, that added together give a palindrome (27772).

The spelling of 212666506 in words is "two hundred twelve million, six hundred sixty-six thousand, five hundred six".