1211100221201 has 8 divisors (see below), whose sum is σ = 1346334737664. Its totient is φ = 1081876127760.

The previous prime is 1211100221167. The next prime is 1211100221333. The reversal of 1211100221201 is 1021220011121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211100221201 - 2⁶ = 1211100221137 is a prime.

It is a super-2 number, since 2×1211100221201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211100221801) 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, 1502605331 + ... + 1502606136.

It is an arithmetic number, because the mean of its divisors is an integer number (168291842208).

Almost surely, 2^{1211100221201} is an apocalyptic number.

It is an amenable number.

1211100221201 is a deficient number, since it is larger than the sum of its proper divisors (135234516463).

1211100221201 is a wasteful number, since it uses less digits than its factorization.

1211100221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005211511.

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

Adding to 1211100221201 its reverse (1021220011121), we get a palindrome (2232320232322).

The spelling of 1211100221201 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twenty-one thousand, two hundred one".