74443020121 has 4 divisors (see below), whose sum is σ = 74451201700. Its totient is φ = 74434838544.

The previous prime is 74443020031. The next prime is 74443020137. The reversal of 74443020121 is 12102034447.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38517987600 + 35925032521 = 196260^2 + 189539^2 .

It is a cyclic number.

It is not a de Polignac number, because 74443020121 - 2¹¹ = 74443018073 is a prime.

It is a super-2 number, since 2×74443020121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74443020121.

It is not an unprimeable number, because it can be changed into a prime (74443020191) 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, 4077126 + ... + 4095343.

It is an arithmetic number, because the mean of its divisors is an integer number (18612800425).

Almost surely, 2^74443020121 is an apocalyptic number.

It is an amenable number.

74443020121 is a deficient number, since it is larger than the sum of its proper divisors (8181579).

74443020121 is an equidigital number, since it uses as much as digits as its factorization.

74443020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8181578.

The product of its (nonzero) digits is 5376, while the sum is 28.

Adding to 74443020121 its reverse (12102034447), we get a palindrome (86545054568).

The spelling of 74443020121 in words is "seventy-four billion, four hundred forty-three million, twenty thousand, one hundred twenty-one".