1221020010073 has 2 divisors, whose sum is σ = 1221020010074. Its totient is φ = 1221020010072.

The previous prime is 1221020010071. The next prime is 1221020010103. The reversal of 1221020010073 is 3700100201221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 824513032729 + 396506977344 = 908027^2 + 629688^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221020010073 - 2¹ = 1221020010071 is a prime.

Together with 1221020010071, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221020010073.

It is not a weakly prime, because it can be changed into another prime (1221020010071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510005036 + 610510005037.

It is an arithmetic number, because the mean of its divisors is an integer number (610510005037).

Almost surely, 2^{1221020010073} is an apocalyptic number.

It is an amenable number.

1221020010073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221020010073 is an equidigital number, since it uses as much as digits as its factorization.

1221020010073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 1221020010073 its reverse (3700100201221), we get a palindrome (4921120211294).

The spelling of 1221020010073 in words is "one trillion, two hundred twenty-one billion, twenty million, ten thousand, seventy-three".