73700021 has 2 divisors, whose sum is σ = 73700022. Its totient is φ = 73700020.

The previous prime is 73700009. The next prime is 73700047. The reversal of 73700021 is 12000737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58599025 + 15100996 = 7655^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 73700021 - 2⁶ = 73699957 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 73699966 and 73700002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73700071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36850010 + 36850011.

It is an arithmetic number, because the mean of its divisors is an integer number (36850011).

Almost surely, 2^73700021 is an apocalyptic number.

It is an amenable number.

73700021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73700021 is an equidigital number, since it uses as much as digits as its factorization.

73700021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 73700021 is about 8584.8716356158. The cubic root of 73700021 is about 419.2655740277.

Adding to 73700021 its reverse (12000737), we get a palindrome (85700758).

The spelling of 73700021 in words is "seventy-three million, seven hundred thousand, twenty-one".