1211101202109 has 16 divisors (see below), whose sum is σ = 1615683960000. Its totient is φ = 806959741056.

The previous prime is 1211101202083. The next prime is 1211101202119. The reversal of 1211101202109 is 9012021011121.

It is not a de Polignac number, because 1211101202109 - 2¹¹ = 1211101200061 is a prime.

It is a super-2 number, since 2×1211101202109² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101202119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63269662 + ... + 63288800.

It is an arithmetic number, because the mean of its divisors is an integer number (100980247500).

Almost surely, 2^{1211101202109} is an apocalyptic number.

It is an amenable number.

1211101202109 is a deficient number, since it is larger than the sum of its proper divisors (404582757891).

1211101202109 is a wasteful number, since it uses less digits than its factorization.

1211101202109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29564.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 1211101202109 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred two thousand, one hundred nine".