1211221200011 has 16 divisors (see below), whose sum is σ = 1283647419648. Its totient is φ = 1138926412800.

The previous prime is 1211221199957. The next prime is 1211221200023. The reversal of 1211221200011 is 1100021221121.

It is a cyclic number.

It is not a de Polignac number, because 1211221200011 - 2³⁴ = 1194041330827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211221200071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96806246 + ... + 96818756.

It is an arithmetic number, because the mean of its divisors is an integer number (80227963728).

Almost surely, 2^{1211221200011} is an apocalyptic number.

1211221200011 is a deficient number, since it is larger than the sum of its proper divisors (72426219637).

1211221200011 is a wasteful number, since it uses less digits than its factorization.

1211221200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17302.

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

Adding to 1211221200011 its reverse (1100021221121), we get a palindrome (2311242421132).

The spelling of 1211221200011 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred thousand, eleven".