212115765 has 16 divisors (see below), whose sum is σ = 340644096. Its totient is φ = 112708800.

The previous prime is 212115763. The next prime is 212115779. The reversal of 212115765 is 567511212.

It is not a de Polignac number, because 212115765 - 2¹ = 212115763 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212115763) 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, 22026 + ... + 30155.

It is an arithmetic number, because the mean of its divisors is an integer number (21290256).

Almost surely, 2^212115765 is an apocalyptic number.

It is an amenable number.

212115765 is a deficient number, since it is larger than the sum of its proper divisors (128528331).

212115765 is a wasteful number, since it uses less digits than its factorization.

212115765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52460.

The product of its digits is 4200, while the sum is 30.

The square root of 212115765 is about 14564.1946224294. The cubic root of 212115765 is about 596.3817099346.

Adding to 212115765 its reverse (567511212), we get a palindrome (779626977).

The spelling of 212115765 in words is "two hundred twelve million, one hundred fifteen thousand, seven hundred sixty-five".