73111021 has 2 divisors, whose sum is σ = 73111022. Its totient is φ = 73111020.

The previous prime is 73111019. The next prime is 73111037. The reversal of 73111021 is 12011137.

It is an a-pointer prime, because the next prime (73111037) can be obtained adding 73111021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69538921 + 3572100 = 8339^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 73111021 - 2¹ = 73111019 is a prime.

Together with 73111019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 73110986 and 73111004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73111091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36555510 + 36555511.

It is an arithmetic number, because the mean of its divisors is an integer number (36555511).

Almost surely, 2^73111021 is an apocalyptic number.

It is an amenable number.

73111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73111021 is an equidigital number, since it uses as much as digits as its factorization.

73111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 73111021 is about 8550.4982895735. The cubic root of 73111021 is about 418.1456819193.

Adding to 73111021 its reverse (12011137), we get a palindrome (85122158).

The spelling of 73111021 in words is "seventy-three million, one hundred eleven thousand, twenty-one".