212540505266 has 4 divisors (see below), whose sum is σ = 318810757902. Its totient is φ = 106270252632.

The previous prime is 212540505227. The next prime is 212540505293. The reversal of 212540505266 is 662505045212.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 116164407241 + 96376098025 = 340829^2 + 310445^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53135126315 + ... + 53135126318.

Almost surely, 2^212540505266 is an apocalyptic number.

212540505266 is a deficient number, since it is larger than the sum of its proper divisors (106270252636).

212540505266 is a wasteful number, since it uses less digits than its factorization.

212540505266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106270252635.

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 212540505266 in words is "two hundred twelve billion, five hundred forty million, five hundred five thousand, two hundred sixty-six".