74742675421 has 4 divisors (see below), whose sum is σ = 75967965244. Its totient is φ = 73517385600.

The previous prime is 74742675419. The next prime is 74742675451. The reversal of 74742675421 is 12457624747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12457624747 = 15173 ⋅821039.

It can be written as a sum of positive squares in 2 ways, for example, as 15274488100 + 59468187321 = 123590^2 + 243861^2 .

It is a cyclic number.

It is not a de Polignac number, because 74742675421 - 2¹ = 74742675419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74742675401) 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, 612644820 + ... + 612644941.

It is an arithmetic number, because the mean of its divisors is an integer number (18991991311).

Almost surely, 2^74742675421 is an apocalyptic number.

It is an amenable number.

74742675421 is a deficient number, since it is larger than the sum of its proper divisors (1225289823).

74742675421 is a wasteful number, since it uses less digits than its factorization.

74742675421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225289822.

The product of its digits is 2634240, while the sum is 49.

The spelling of 74742675421 in words is "seventy-four billion, seven hundred forty-two million, six hundred seventy-five thousand, four hundred twenty-one".