74566021 has 2 divisors, whose sum is σ = 74566022. Its totient is φ = 74566020.

The previous prime is 74565991. The next prime is 74566043. The reversal of 74566021 is 12066547.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 35640900 = 6239^2 + 5970^2 .

It is an emirp because it is prime and its reverse (12066547) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74566021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74566061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37283010 + 37283011.

It is an arithmetic number, because the mean of its divisors is an integer number (37283011).

Almost surely, 2^74566021 is an apocalyptic number.

It is an amenable number.

74566021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74566021 is an equidigital number, since it uses as much as digits as its factorization.

74566021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 74566021 is about 8635.1618977295. The cubic root of 74566021 is about 420.9013541086.

It can be divided in two parts, 745 and 66021, that added together give a palindrome (66766).

The spelling of 74566021 in words is "seventy-four million, five hundred sixty-six thousand, twenty-one".