83506112021 has 4 divisors (see below), whose sum is σ = 83506958700. Its totient is φ = 83505265344.

The previous prime is 83506112017. The next prime is 83506112023. The reversal of 83506112021 is 12021160538.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12021160538 = 2 ⋅6010580269.

It can be written as a sum of positive squares in 2 ways, for example, as 56202184900 + 27303927121 = 237070^2 + 165239^2 .

It is a cyclic number.

It is not a de Polignac number, because 83506112021 - 2² = 83506112017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83506112023) 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, 252386 + ... + 480323.

It is an arithmetic number, because the mean of its divisors is an integer number (20876739675).

Almost surely, 2^83506112021 is an apocalyptic number.

It is an amenable number.

83506112021 is a deficient number, since it is larger than the sum of its proper divisors (846679).

83506112021 is a wasteful number, since it uses less digits than its factorization.

83506112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846678.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 83506112021 its reverse (12021160538), we get a palindrome (95527272559).

The spelling of 83506112021 in words is "eighty-three billion, five hundred six million, one hundred twelve thousand, twenty-one".