1221102210173 has 2 divisors, whose sum is σ = 1221102210174. Its totient is φ = 1221102210172.

The previous prime is 1221102210121. The next prime is 1221102210233. The reversal of 1221102210173 is 3710122011221.

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., 782087303449 + 439014906724 = 884357^2 + 662582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221102210173 - 2⁸ = 1221102209917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221102210113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551105086 + 610551105087.

It is an arithmetic number, because the mean of its divisors is an integer number (610551105087).

Almost surely, 2^{1221102210173} is an apocalyptic number.

It is an amenable number.

1221102210173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102210173 is an equidigital number, since it uses as much as digits as its factorization.

1221102210173 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 1221102210173 its reverse (3710122011221), we get a palindrome (4931224221394).

The spelling of 1221102210173 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred ten thousand, one hundred seventy-three".