1110221209961 has 2 divisors, whose sum is σ = 1110221209962. Its totient is φ = 1110221209960.

The previous prime is 1110221209897. The next prime is 1110221209963. The reversal of 1110221209961 is 1699021220111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720868921600 + 389352288361 = 849040^2 + 623981^2 .

It is a cyclic number.

It is not a de Polignac number, because 1110221209961 - 2⁶ = 1110221209897 is a prime.

It is a super-2 number, since 2×1110221209961² (a number of 25 digits) contains 22 as substring.

Together with 1110221209963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1110221209963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555110604980 + 555110604981.

It is an arithmetic number, because the mean of its divisors is an integer number (555110604981).

Almost surely, 2^{1110221209961} is an apocalyptic number.

It is an amenable number.

1110221209961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1110221209961 is an equidigital number, since it uses as much as digits as its factorization.

1110221209961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 1110221209961 in words is "one trillion, one hundred ten billion, two hundred twenty-one million, two hundred nine thousand, nine hundred sixty-one".