1221102220209 has 16 divisors (see below), whose sum is σ = 1633373520960. Its totient is φ = 811449852480.

The previous prime is 1221102220199. The next prime is 1221102220211. The reversal of 1221102220209 is 9020222011221.

It is not a de Polignac number, because 1221102220209 - 2¹³ = 1221102212017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221102220229) 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, 21398487 + ... + 21455475.

It is an arithmetic number, because the mean of its divisors is an integer number (102085845060).

Almost surely, 2^{1221102220209} is an apocalyptic number.

It is an amenable number.

1221102220209 is a deficient number, since it is larger than the sum of its proper divisors (412271300751).

1221102220209 is a wasteful number, since it uses less digits than its factorization.

1221102220209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79840.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 1221102220209 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty thousand, two hundred nine".