73772021 has 2 divisors, whose sum is σ = 73772022. Its totient is φ = 73772020.

The previous prime is 73772009. The next prime is 73772051. The reversal of 73772021 is 12027737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 7349521 = 8150^2 + 2711^2 .

It is an emirp because it is prime and its reverse (12027737) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73772021 - 2¹⁰ = 73770997 is a prime.

It is a super-2 number, since 2×73772021² = 10884622164848882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73772051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36886010 + 36886011.

It is an arithmetic number, because the mean of its divisors is an integer number (36886011).

Almost surely, 2^73772021 is an apocalyptic number.

It is an amenable number.

73772021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73772021 is an equidigital number, since it uses as much as digits as its factorization.

73772021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 73772021 is about 8589.0640351554. The cubic root of 73772021 is about 419.4020610824.

Adding to 73772021 its reverse (12027737), we get a palindrome (85799758).

The spelling of 73772021 in words is "seventy-three million, seven hundred seventy-two thousand, twenty-one".