19010101011221 has 4 divisors (see below), whose sum is σ = 19010652750732. Its totient is φ = 19009549271712.

The previous prime is 19010101011199. The next prime is 19010101011227. The reversal of 19010101011221 is 12211010101091.

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 5034571126225 + 13975529884996 = 2243785^2 + 3738386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19010101011221 is a prime.

It is a super-2 number, since 2×19010101011221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19010101011193 and 19010101011202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19010101011227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275818070 + ... + 275886983.

It is an arithmetic number, because the mean of its divisors is an integer number (4752663187683).

Almost surely, 2^{19010101011221} is an apocalyptic number.

It is an amenable number.

19010101011221 is a deficient number, since it is larger than the sum of its proper divisors (551739511).

19010101011221 is an equidigital number, since it uses as much as digits as its factorization.

19010101011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551739510.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 19010101011221 in words is "nineteen trillion, ten billion, one hundred one million, eleven thousand, two hundred twenty-one".