1221101102211 has 8 divisors (see below), whose sum is σ = 1684277382480. Its totient is φ = 785996111712.

The previous prime is 1221101102173. The next prime is 1221101102213. The reversal of 1221101102211 is 1122011011221.

It is a happy number.

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

It is not a de Polignac number, because 1221101102211 - 2¹⁹ = 1221100577923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221101102213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7017822340 + ... + 7017822513.

It is an arithmetic number, because the mean of its divisors is an integer number (210534672810).

Almost surely, 2^{1221101102211} is an apocalyptic number.

1221101102211 is a deficient number, since it is larger than the sum of its proper divisors (463176280269).

1221101102211 is a wasteful number, since it uses less digits than its factorization.

1221101102211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14035644885.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221101102211 its reverse (1122011011221), we get a palindrome (2343112113432).

The spelling of 1221101102211 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred two thousand, two hundred eleven".