74737021 has 2 divisors, whose sum is σ = 74737022. Its totient is φ = 74737020.

The previous prime is 74736989. The next prime is 74737027. The reversal of 74737021 is 12073747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72914521 + 1822500 = 8539^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 74737021 - 2⁵ = 74736989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74737027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37368510 + 37368511.

It is an arithmetic number, because the mean of its divisors is an integer number (37368511).

Almost surely, 2^74737021 is an apocalyptic number.

It is an amenable number.

74737021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74737021 is an equidigital number, since it uses as much as digits as its factorization.

74737021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 74737021 is about 8645.0576053604. The cubic root of 74737021 is about 421.2228552512. Note that the first 3 decimals are identical.

The spelling of 74737021 in words is "seventy-four million, seven hundred thirty-seven thousand, twenty-one".