1221110200091 has 8 divisors (see below), whose sum is σ = 1263327953520. Its totient is φ = 1178899813728.

The previous prime is 1221110200049. The next prime is 1221110200109. The reversal of 1221110200091 is 1900020111221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221110200091 - 2³⁴ = 1203930330907 is a prime.

It is a super-3 number, since 3×1221110200091³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1221110230091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503476 + ... + 2168561.

It is an arithmetic number, because the mean of its divisors is an integer number (157915994190).

Almost surely, 2^{1221110200091} is an apocalyptic number.

1221110200091 is a deficient number, since it is larger than the sum of its proper divisors (42217753429).

1221110200091 is a wasteful number, since it uses less digits than its factorization.

1221110200091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683533.

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

The spelling of 1221110200091 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two hundred thousand, ninety-one".