74881021 has 2 divisors, whose sum is σ = 74881022. Its totient is φ = 74881020.

The previous prime is 74880989. The next prime is 74881043. The reversal of 74881021 is 12018847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46376100 + 28504921 = 6810^2 + 5339^2 .

It is a cyclic number.

It is not a de Polignac number, because 74881021 - 2⁵ = 74880989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74881321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37440510 + 37440511.

It is an arithmetic number, because the mean of its divisors is an integer number (37440511).

Almost surely, 2^74881021 is an apocalyptic number.

It is an amenable number.

74881021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74881021 is an equidigital number, since it uses as much as digits as its factorization.

74881021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 74881021 is about 8653.3820555896. The cubic root of 74881021 is about 421.4932129021.

Adding to 74881021 its reverse (12018847), we get a palindrome (86899868).

The spelling of 74881021 in words is "seventy-four million, eight hundred eighty-one thousand, twenty-one".