1221112200109 has 4 divisors (see below), whose sum is σ = 1241809017120. Its totient is φ = 1200415383100.

The previous prime is 1221112200083. The next prime is 1221112200179. The reversal of 1221112200109 is 9010022111221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221112200109 - 2⁹ = 1221112199597 is a prime.

It is a super-2 number, since 2×1221112200109² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221112200109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221112200179) 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, 10348408417 + ... + 10348408534.

It is an arithmetic number, because the mean of its divisors is an integer number (310452254280).

Almost surely, 2^{1221112200109} is an apocalyptic number.

It is an amenable number.

1221112200109 is a deficient number, since it is larger than the sum of its proper divisors (20696817011).

1221112200109 is an equidigital number, since it uses as much as digits as its factorization.

1221112200109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20696817010.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1221112200109 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred thousand, one hundred nine".