1221112210109 has 4 divisors (see below), whose sum is σ = 1332122411040. Its totient is φ = 1110102009180.

The previous prime is 1221112210099. The next prime is 1221112210169. The reversal of 1221112210109 is 9010122111221.

It is a happy number.

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 1221112210109 - 2⁴⁰ = 121600582333 is a prime.

It is a super-2 number, since 2×1221112210109² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221112210169) 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, 55505100449 + ... + 55505100470.

It is an arithmetic number, because the mean of its divisors is an integer number (333030602760).

Almost surely, 2^{1221112210109} is an apocalyptic number.

It is an amenable number.

1221112210109 is a deficient number, since it is larger than the sum of its proper divisors (111010200931).

1221112210109 is a wasteful number, since it uses less digits than its factorization.

1221112210109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111010200930.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1221112210109 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred ten thousand, one hundred nine".