820112210987 has 4 divisors (see below), whose sum is σ = 832352691816. Its totient is φ = 807871730160.

The previous prime is 820112210873. The next prime is 820112210999. The reversal of 820112210987 is 789012211028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820112210987 - 2³² = 815817243691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820112210387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6120240314 + ... + 6120240447.

It is an arithmetic number, because the mean of its divisors is an integer number (208088172954).

Almost surely, 2^820112210987 is an apocalyptic number.

820112210987 is a deficient number, since it is larger than the sum of its proper divisors (12240480829).

820112210987 is a wasteful number, since it uses less digits than its factorization.

820112210987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12240480828.

The product of its (nonzero) digits is 32256, while the sum is 41.

Adding to 820112210987 its sum of digits (41), we get a palindrome (820112211028).

The spelling of 820112210987 in words is "eight hundred twenty billion, one hundred twelve million, two hundred ten thousand, nine hundred eighty-seven".