1221101200109 has 16 divisors (see below), whose sum is σ = 1397691686400. Its totient is φ = 1045047965184.

The previous prime is 1221101200091. The next prime is 1221101200127. The reversal of 1221101200109 is 9010021011221.

It is an interprime number because it is at equal distance from previous prime (1221101200091) and next prime (1221101200127).

It is a cyclic number.

It is not a de Polignac number, because 1221101200109 - 2⁸ = 1221101199853 is a prime.

It is a super-2 number, since 2×1221101200109² (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 (1221101200169) 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, 70262429 + ... + 70279805.

It is an arithmetic number, because the mean of its divisors is an integer number (87355730400).

Almost surely, 2^{1221101200109} is an apocalyptic number.

It is an amenable number.

1221101200109 is a deficient number, since it is larger than the sum of its proper divisors (176590486291).

1221101200109 is a wasteful number, since it uses less digits than its factorization.

1221101200109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32252.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1221101200109 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred thousand, one hundred nine".