73121110220201 has 2 divisors, whose sum is σ = 73121110220202. Its totient is φ = 73121110220200.

The previous prime is 73121110220189. The next prime is 73121110220261. The reversal of 73121110220201 is 10202201112137.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39295847449600 + 33825262770601 = 6268640^2 + 5815949^2 .

It is an emirp because it is prime and its reverse (10202201112137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73121110220201 - 2⁴⁶ = 2752366042537 is a prime.

It is not a weakly prime, because it can be changed into another prime (73121110220261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36560555110100 + 36560555110101.

It is an arithmetic number, because the mean of its divisors is an integer number (36560555110101).

Almost surely, 2^{73121110220201} is an apocalyptic number.

It is an amenable number.

73121110220201 is a deficient number, since it is larger than the sum of its proper divisors (1).

73121110220201 is an equidigital number, since it uses as much as digits as its factorization.

73121110220201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 73121110220201 its reverse (10202201112137), we get a palindrome (83323311332338).

The spelling of 73121110220201 in words is "seventy-three trillion, one hundred twenty-one billion, one hundred ten million, two hundred twenty thousand, two hundred one".