212365778991 has 8 divisors (see below), whose sum is σ = 285752118960. Its totient is φ = 140278312512.

The previous prime is 212365778987. The next prime is 212365779019. The reversal of 212365778991 is 199877563212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212365778991 - 2² = 212365778987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212365778971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324717990 + ... + 324718643.

It is an arithmetic number, because the mean of its divisors is an integer number (35719014870).

Almost surely, 2^212365778991 is an apocalyptic number.

212365778991 is a deficient number, since it is larger than the sum of its proper divisors (73386339969).

212365778991 is a wasteful number, since it uses less digits than its factorization.

212365778991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649436745.

The product of its digits is 11430720, while the sum is 60.

The spelling of 212365778991 in words is "two hundred twelve billion, three hundred sixty-five million, seven hundred seventy-eight thousand, nine hundred ninety-one".