74172317021 has 16 divisors (see below), whose sum is σ = 85418088000. Its totient is φ = 63697363200.

The previous prime is 74172316979. The next prime is 74172317039. The reversal of 74172317021 is 12071327147.

It is not a de Polignac number, because 74172317021 - 2⁶ = 74172316957 is a prime.

It is a super-2 number, since 2×74172317021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74172317071) 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, 435500 + ... + 581381.

It is an arithmetic number, because the mean of its divisors is an integer number (5338630500).

Almost surely, 2^74172317021 is an apocalyptic number.

It is an amenable number.

74172317021 is a deficient number, since it is larger than the sum of its proper divisors (11245770979).

74172317021 is a wasteful number, since it uses less digits than its factorization.

74172317021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017260.

The product of its (nonzero) digits is 16464, while the sum is 35.

It can be divided in two parts, 74172 and 317021, that added together give a palindrome (391193).

The spelling of 74172317021 in words is "seventy-four billion, one hundred seventy-two million, three hundred seventeen thousand, twenty-one".