1220221012109 has 16 divisors (see below), whose sum is σ = 1389114261504. Its totient is φ = 1060994550000.

The previous prime is 1220221012099. The next prime is 1220221012117. The reversal of 1220221012109 is 9012101220221.

It is not a de Polignac number, because 1220221012109 - 2⁴⁰ = 120709384333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221012159) 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, 4081484 + ... + 4370234.

It is an arithmetic number, because the mean of its divisors is an integer number (86819641344).

Almost surely, 2^{1220221012109} is an apocalyptic number.

It is an amenable number.

1220221012109 is a deficient number, since it is larger than the sum of its proper divisors (168893249395).

1220221012109 is a wasteful number, since it uses less digits than its factorization.

1220221012109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305488.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1220221012109 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, twelve thousand, one hundred nine".