812011121 has 8 divisors (see below), whose sum is σ = 816000000. Its totient is φ = 808030080.

The previous prime is 812011099. The next prime is 812011129. The reversal of 812011121 is 121110218.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812011121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812011121.

It is not an unprimeable number, because it can be changed into a prime (812011129) 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, 337280 + ... + 339678.

It is an arithmetic number, because the mean of its divisors is an integer number (102000000).

Almost surely, 2^812011121 is an apocalyptic number.

It is an amenable number.

812011121 is a deficient number, since it is larger than the sum of its proper divisors (3988879).

812011121 is a wasteful number, since it uses less digits than its factorization.

812011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3919.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 812011121 is about 28495.8088321774. The cubic root of 812011121 is about 932.9405981863.

Adding to 812011121 its reverse (121110218), we get a palindrome (933121339).

The spelling of 812011121 in words is "eight hundred twelve million, eleven thousand, one hundred twenty-one".