84721331 has 4 divisors (see below), whose sum is σ = 84754032. Its totient is φ = 84688632.

The previous prime is 84721327. The next prime is 84721333. The reversal of 84721331 is 13312748.

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

It is a cyclic number.

It is not a de Polignac number, because 84721331 - 2² = 84721327 is a prime.

It is a super-2 number, since 2×84721331² = 14355407852823122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84721294 and 84721303.

It is not an unprimeable number, because it can be changed into a prime (84721333) 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, 12095 + ... + 17768.

It is an arithmetic number, because the mean of its divisors is an integer number (21188508).

Almost surely, 2^84721331 is an apocalyptic number.

84721331 is a deficient number, since it is larger than the sum of its proper divisors (32701).

84721331 is a wasteful number, since it uses less digits than its factorization.

84721331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32700.

The product of its digits is 4032, while the sum is 29.

The square root of 84721331 is about 9204.4191017141. The cubic root of 84721331 is about 439.2019469961.

The spelling of 84721331 in words is "eighty-four million, seven hundred twenty-one thousand, three hundred thirty-one".