74066021 has 4 divisors (see below), whose sum is σ = 75171552. Its totient is φ = 72960492.

The previous prime is 74065997. The next prime is 74066039. The reversal of 74066021 is 12066047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12066047 = 7 ⋅1723721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74066021 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 (74066521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552665 + ... + 552798.

It is an arithmetic number, because the mean of its divisors is an integer number (18792888).

Almost surely, 2^74066021 is an apocalyptic number.

It is an amenable number.

74066021 is a deficient number, since it is larger than the sum of its proper divisors (1105531).

74066021 is a wasteful number, since it uses less digits than its factorization.

74066021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105530.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 74066021 is about 8606.1618041959. The cubic root of 74066021 is about 419.9584633904.

Adding to 74066021 its sum of digits (26), we get a palindrome (74066047).

The spelling of 74066021 in words is "seventy-four million, sixty-six thousand, twenty-one".