74045021 has 2 divisors, whose sum is σ = 74045022. Its totient is φ = 74045020.

The previous prime is 74045017. The next prime is 74045087. The reversal of 74045021 is 12054047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44222500 + 29822521 = 6650^2 + 5461^2 .

It is a cyclic number.

It is not a de Polignac number, because 74045021 - 2² = 74045017 is a prime.

It is equal to p_4341731 and since 74045021 and 4341731 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74041021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37022510 + 37022511.

It is an arithmetic number, because the mean of its divisors is an integer number (37022511).

Almost surely, 2^74045021 is an apocalyptic number.

It is an amenable number.

74045021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74045021 is an equidigital number, since it uses as much as digits as its factorization.

74045021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 74045021 is about 8604.9416616268. The cubic root of 74045021 is about 419.9187692489.

Adding to 74045021 its reverse (12054047), we get a palindrome (86099068).

The spelling of 74045021 in words is "seventy-four million, forty-five thousand, twenty-one".