1221102200999 has 4 divisors (see below), whose sum is σ = 1221395809920. Its totient is φ = 1220808592080.

The previous prime is 1221102200959. The next prime is 1221102201017. The reversal of 1221102200999 is 9990022011221.

It is a happy number.

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 1221102200999 - 2⁸ = 1221102200743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102200959) 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, 146798222 + ... + 146806539.

It is an arithmetic number, because the mean of its divisors is an integer number (305348952480).

Almost surely, 2^{1221102200999} is an apocalyptic number.

1221102200999 is a deficient number, since it is larger than the sum of its proper divisors (293608921).

1221102200999 is an equidigital number, since it uses as much as digits as its factorization.

1221102200999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293608920.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 1221102200999 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred thousand, nine hundred ninety-nine".