74389241721 has 16 divisors (see below), whose sum is σ = 99729108864. Its totient is φ = 49321799424.

The previous prime is 74389241713. The next prime is 74389241761. The reversal of 74389241721 is 12714298347.

It is not a de Polignac number, because 74389241721 - 2³ = 74389241713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74389241701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341185 + ... + 514961.

It is an arithmetic number, because the mean of its divisors is an integer number (6233069304).

Almost surely, 2^74389241721 is an apocalyptic number.

It is an amenable number.

74389241721 is a deficient number, since it is larger than the sum of its proper divisors (25339867143).

74389241721 is a wasteful number, since it uses less digits than its factorization.

74389241721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174560.

The product of its digits is 677376, while the sum is 48.

The spelling of 74389241721 in words is "seventy-four billion, three hundred eighty-nine million, two hundred forty-one thousand, seven hundred twenty-one".