1211001102221 has 4 divisors (see below), whose sum is σ = 1211058985500. Its totient is φ = 1210943218944.

The previous prime is 1211001102197. The next prime is 1211001102229. The reversal of 1211001102221 is 1222011001121.

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 508440302500 + 702560799721 = 713050^2 + 838189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211001102221 - 2²² = 1210996907917 is a prime.

It is a super-2 number, since 2×1211001102221² (a number of 25 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 = 1211001102196 and 1211001102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211001102229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28910246 + ... + 28952103.

It is an arithmetic number, because the mean of its divisors is an integer number (302764746375).

Almost surely, 2^{1211001102221} is an apocalyptic number.

It is an amenable number.

1211001102221 is a deficient number, since it is larger than the sum of its proper divisors (57883279).

1211001102221 is an equidigital number, since it uses as much as digits as its factorization.

1211001102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57883278.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211001102221 its reverse (1222011001121), we get a palindrome (2433012103342).

The spelling of 1211001102221 in words is "one trillion, two hundred eleven billion, one million, one hundred two thousand, two hundred twenty-one".