10555170101221 has 4 divisors (see below), whose sum is σ = 10555321840812. Its totient is φ = 10555018361632.

The previous prime is 10555170101191. The next prime is 10555170101227. The reversal of 10555170101221 is 12210107155501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6105964550625 + 4449205550596 = 2471025^2 + 2109314^2 .

It is a cyclic number.

It is not a de Polignac number, because 10555170101221 - 2⁷ = 10555170101093 is a prime.

It is a super-2 number, since 2×10555170101221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10555170101227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75765406 + ... + 75904591.

It is an arithmetic number, because the mean of its divisors is an integer number (2638830460203).

Almost surely, 2^{10555170101221} is an apocalyptic number.

It is an amenable number.

10555170101221 is a deficient number, since it is larger than the sum of its proper divisors (151739591).

10555170101221 is an equidigital number, since it uses as much as digits as its factorization.

10555170101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151739590.

The product of its (nonzero) digits is 3500, while the sum is 31.

Adding to 10555170101221 its reverse (12210107155501), we get a palindrome (22765277256722).

The spelling of 10555170101221 in words is "ten trillion, five hundred fifty-five billion, one hundred seventy million, one hundred one thousand, two hundred twenty-one".