84271377721 has 4 divisors (see below), whose sum is σ = 84273582052. Its totient is φ = 84269173392.

The previous prime is 84271377703. The next prime is 84271377793. The reversal of 84271377721 is 12777317248.

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 30542455696 + 53728922025 = 174764^2 + 231795^2 .

It is a cyclic number.

It is not a de Polignac number, because 84271377721 - 2¹¹ = 84271375673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84271377121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043790 + ... + 1121623.

It is an arithmetic number, because the mean of its divisors is an integer number (21068395513).

Almost surely, 2^84271377721 is an apocalyptic number.

It is an amenable number.

84271377721 is a deficient number, since it is larger than the sum of its proper divisors (2204331).

84271377721 is a wasteful number, since it uses less digits than its factorization.

84271377721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204330.

The product of its digits is 921984, while the sum is 49.

The spelling of 84271377721 in words is "eighty-four billion, two hundred seventy-one million, three hundred seventy-seven thousand, seven hundred twenty-one".