84013739721 has 12 divisors (see below), whose sum is σ = 121408900080. Its totient is φ = 55983442680.

The previous prime is 84013739707. The next prime is 84013739737. The reversal of 84013739721 is 12793731048.

It is not a de Polignac number, because 84013739721 - 2⁹ = 84013739209 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (84013739021) 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 11 ways as a sum of consecutive naturals, for example, 2122395 + ... + 2161616.

It is an arithmetic number, because the mean of its divisors is an integer number (10117408340).

Almost surely, 2^84013739721 is an apocalyptic number.

It is an amenable number.

84013739721 is a deficient number, since it is larger than the sum of its proper divisors (37395160359).

84013739721 is a wasteful number, since it uses less digits than its factorization.

84013739721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286196 (or 4286193 counting only the distinct ones).

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

The spelling of 84013739721 in words is "eighty-four billion, thirteen million, seven hundred thirty-nine thousand, seven hundred twenty-one".