212766261 has 16 divisors (see below), whose sum is σ = 303246720. Its totient is φ = 132366080.

The previous prime is 212766251. The next prime is 212766289. The reversal of 212766261 is 162667212.

It is a cyclic number.

It is not a de Polignac number, because 212766261 - 2¹⁹ = 212241973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212766251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34776 + ... + 40433.

It is an arithmetic number, because the mean of its divisors is an integer number (18952920).

Almost surely, 2^212766261 is an apocalyptic number.

It is an amenable number.

212766261 is a deficient number, since it is larger than the sum of its proper divisors (90480459).

212766261 is a wasteful number, since it uses less digits than its factorization.

212766261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75276.

The product of its digits is 12096, while the sum is 33.

The square root of 212766261 is about 14586.5095550649. The cubic root of 212766261 is about 596.9907296075.

The spelling of 212766261 in words is "two hundred twelve million, seven hundred sixty-six thousand, two hundred sixty-one".