1221222100011 has 16 divisors (see below), whose sum is σ = 1760320147200. Its totient is φ = 750452270688.

The previous prime is 1221222099901. The next prime is 1221222100031. The reversal of 1221222100011 is 1100012221221.

It is not a de Polignac number, because 1221222100011 - 2³⁹ = 671466286123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221222100031) 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, 289524231 + ... + 289528448.

It is an arithmetic number, because the mean of its divisors is an integer number (110020009200).

Almost surely, 2^{1221222100011} is an apocalyptic number.

1221222100011 is a deficient number, since it is larger than the sum of its proper divisors (539098047189).

1221222100011 is a wasteful number, since it uses less digits than its factorization.

1221222100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579052738.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221222100011 its reverse (1100012221221), we get a palindrome (2321234321232).

The spelling of 1221222100011 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, eleven".