83836212725021 has 4 divisors (see below), whose sum is σ = 83836642424412. Its totient is φ = 83835783025632.

The previous prime is 83836212724997. The next prime is 83836212725087. The reversal of 83836212725021 is 12052721263838.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17761083072100 + 66075129652921 = 4214390^2 + 8128661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83836212725021 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 (83836212725521) 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, 214556906 + ... + 214947291.

It is an arithmetic number, because the mean of its divisors is an integer number (20959160606103).

Almost surely, 2^{83836212725021} is an apocalyptic number.

It is an amenable number.

83836212725021 is a deficient number, since it is larger than the sum of its proper divisors (429699391).

83836212725021 is a wasteful number, since it uses less digits than its factorization.

83836212725021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429699390.

The product of its (nonzero) digits is 1935360, while the sum is 50.

Adding to 83836212725021 its reverse (12052721263838), we get a palindrome (95888933988859).

The spelling of 83836212725021 in words is "eighty-three trillion, eight hundred thirty-six billion, two hundred twelve million, seven hundred twenty-five thousand, twenty-one".