1211111300221 has 8 divisors (see below), whose sum is σ = 1240065362304. Its totient is φ = 1182477172800.

The previous prime is 1211111300177. The next prime is 1211111300237. The reversal of 1211111300221 is 1220031111121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211111300221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211111300195 and 1211111300204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111400221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79976005 + ... + 79991146.

It is an arithmetic number, because the mean of its divisors is an integer number (155008170288).

Almost surely, 2^{1211111300221} is an apocalyptic number.

It is an amenable number.

1211111300221 is a deficient number, since it is larger than the sum of its proper divisors (28954062083).

1211111300221 is a wasteful number, since it uses less digits than its factorization.

1211111300221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159967331.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1211111300221 its reverse (1220031111121), we get a palindrome (2431142411342).

The spelling of 1211111300221 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred thousand, two hundred twenty-one".