121221010210073 has 2 divisors, whose sum is σ = 121221010210074. Its totient is φ = 121221010210072.

The previous prime is 121221010209997. The next prime is 121221010210081. The reversal of 121221010210073 is 370012010122121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120377169552409 + 843840657664 = 10971653^2 + 918608^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221010210073 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221010210093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610505105036 + 60610505105037.

It is an arithmetic number, because the mean of its divisors is an integer number (60610505105037).

Almost surely, 2^{121221010210073} is an apocalyptic number.

It is an amenable number.

121221010210073 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221010210073 is an equidigital number, since it uses as much as digits as its factorization.

121221010210073 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 121221010210073 its reverse (370012010122121), we get a palindrome (491233020332194).

The spelling of 121221010210073 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, ten million, two hundred ten thousand, seventy-three".