74300021 has 2 divisors, whose sum is σ = 74300022. Its totient is φ = 74300020.

The previous prime is 74299999. The next prime is 74300029. The reversal of 74300021 is 12000347.

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., 74218225 + 81796 = 8615^2 + 286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74300021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74300029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37150010 + 37150011.

It is an arithmetic number, because the mean of its divisors is an integer number (37150011).

Almost surely, 2^74300021 is an apocalyptic number.

It is an amenable number.

74300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74300021 is an equidigital number, since it uses as much as digits as its factorization.

74300021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 74300021 is about 8619.7459939374. The cubic root of 74300021 is about 420.4002627946.

Adding to 74300021 its reverse (12000347), we get a palindrome (86300368).

The spelling of 74300021 in words is "seventy-four million, three hundred thousand, twenty-one".