1221102101099 has 4 divisors (see below), whose sum is σ = 1221128664600. Its totient is φ = 1221075537600.

The previous prime is 1221102101041. The next prime is 1221102101111. The reversal of 1221102101099 is 9901012011221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221102101099 - 2¹² = 1221102097003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221102103099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13212677 + ... + 13304774.

It is an arithmetic number, because the mean of its divisors is an integer number (305282166150).

Almost surely, 2^{1221102101099} is an apocalyptic number.

1221102101099 is a deficient number, since it is larger than the sum of its proper divisors (26563501).

1221102101099 is an equidigital number, since it uses as much as digits as its factorization.

1221102101099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26563500.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 1221102101099 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred one thousand, ninety-nine".