74007321521 has 8 divisors (see below), whose sum is σ = 86175641664. Its totient is φ = 62237962800.

The previous prime is 74007321503. The next prime is 74007321533. The reversal of 74007321521 is 12512370047.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74007321521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74007320521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99739955 + ... + 99740696.

It is an arithmetic number, because the mean of its divisors is an integer number (10771955208).

Almost surely, 2^74007321521 is an apocalyptic number.

It is an amenable number.

74007321521 is a deficient number, since it is larger than the sum of its proper divisors (12168320143).

74007321521 is a wasteful number, since it uses less digits than its factorization.

74007321521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199480711.

The product of its (nonzero) digits is 11760, while the sum is 32.

Adding to 74007321521 its reverse (12512370047), we get a palindrome (86519691568).

The spelling of 74007321521 in words is "seventy-four billion, seven million, three hundred twenty-one thousand, five hundred twenty-one".