73910021 has 2 divisors, whose sum is σ = 73910022. Its totient is φ = 73910020.

The previous prime is 73909973. The next prime is 73910029. The reversal of 73910021 is 12001937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 34093921 = 6310^2 + 5839^2 .

It is a cyclic number.

It is not a de Polignac number, because 73910021 - 2¹⁴ = 73893637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73910029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36955010 + 36955011.

It is an arithmetic number, because the mean of its divisors is an integer number (36955011).

Almost surely, 2^73910021 is an apocalyptic number.

It is an amenable number.

73910021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73910021 is an equidigital number, since it uses as much as digits as its factorization.

73910021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 73910021 is about 8597.0937531238. The cubic root of 73910021 is about 419.6634132500.

Adding to 73910021 its reverse (12001937), we get a palindrome (85911958).

The spelling of 73910021 in words is "seventy-three million, nine hundred ten thousand, twenty-one".