83212643827721 has 4 divisors (see below), whose sum is σ = 83212691910672. Its totient is φ = 83212595744772.

The previous prime is 83212643827711. The next prime is 83212643827739. The reversal of 83212643827721 is 12772834621238.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83212643827721 - 2²⁶ = 83212576718857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83212643827711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21344735 + ... + 24940388.

It is an arithmetic number, because the mean of its divisors is an integer number (20803172977668).

Almost surely, 2^{83212643827721} is an apocalyptic number.

It is an amenable number.

83212643827721 is a deficient number, since it is larger than the sum of its proper divisors (48082951).

83212643827721 is a wasteful number, since it uses less digits than its factorization.

83212643827721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48082950.

The product of its digits is 10838016, while the sum is 56.

The spelling of 83212643827721 in words is "eighty-three trillion, two hundred twelve billion, six hundred forty-three million, eight hundred twenty-seven thousand, seven hundred twenty-one".