1221102111011 has 8 divisors (see below), whose sum is σ = 1234219158048. Its totient is φ = 1208005200000.

The previous prime is 1221102110959. The next prime is 1221102111017. The reversal of 1221102111011 is 1101112011221.

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 1221102111011 - 2²² = 1221097916707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221102111017) 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, 4912055 + ... + 5154656.

It is an arithmetic number, because the mean of its divisors is an integer number (154277394756).

Almost surely, 2^{1221102111011} is an apocalyptic number.

1221102111011 is a deficient number, since it is larger than the sum of its proper divisors (13117047037).

1221102111011 is a wasteful number, since it uses less digits than its factorization.

1221102111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068013.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1221102111011 its reverse (1101112011221), we get a palindrome (2322214122232).

The spelling of 1221102111011 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred eleven thousand, eleven".