212065021761 has 4 divisors (see below), whose sum is σ = 282753362352. Its totient is φ = 141376681172.

The previous prime is 212065021757. The next prime is 212065021769. The reversal of 212065021761 is 167120560212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212065021761 - 2² = 212065021757 is a prime.

It is a super-2 number, since 2×212065021761² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212065021769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35344170291 + ... + 35344170296.

It is an arithmetic number, because the mean of its divisors is an integer number (70688340588).

Almost surely, 2^212065021761 is an apocalyptic number.

It is an amenable number.

212065021761 is a deficient number, since it is larger than the sum of its proper divisors (70688340591).

212065021761 is an equidigital number, since it uses as much as digits as its factorization.

212065021761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70688340590.

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 212065021761 its reverse (167120560212), we get a palindrome (379185581973).

The spelling of 212065021761 in words is "two hundred twelve billion, sixty-five million, twenty-one thousand, seven hundred sixty-one".