84791033721 has 27 divisors (see below), whose sum is σ = 126882786511. Its totient is φ = 54561830064.

The previous prime is 84791033699. The next prime is 84791033729. The reversal of 84791033721 is 12733019748.

The square root of 84791033721 is 291189.

It is a perfect power (a square), and thus also a powerful number.

84791033721 is a `hidden beast` number, since 8 + 479 + 103 + 3 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44462361321 + 40328672400 = 210861^2 + 200820^2 .

It is not a de Polignac number, because 84791033721 - 2⁵ = 84791033689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84791033729) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25331770 + ... + 25335116.

Almost surely, 2^84791033721 is an apocalyptic number.

84791033721 is the 291189-th square number.

84791033721 is the 145595-th centered octagonal number.

It is an amenable number.

84791033721 is a deficient number, since it is larger than the sum of its proper divisors (42091752790).

84791033721 is an frugal number, since it uses more digits than its factorization.

84791033721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758 (or 3379 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 84791033721 in words is "eighty-four billion, seven hundred ninety-one million, thirty-three thousand, seven hundred twenty-one".