1100001212221 has 8 divisors (see below), whose sum is σ = 1101430309824. Its totient is φ = 1098572818560.

The previous prime is 1100001212213. The next prime is 1100001212267. The reversal of 1100001212221 is 1222121000011.

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 1100001212221 - 2³ = 1100001212213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100001212621) 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, 2988141 + ... + 3336013.

It is an arithmetic number, because the mean of its divisors is an integer number (137678788728).

Almost surely, 2^{1100001212221} is an apocalyptic number.

It is an amenable number.

1100001212221 is a deficient number, since it is larger than the sum of its proper divisors (1429097603).

1100001212221 is a wasteful number, since it uses less digits than its factorization.

1100001212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351971.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1100001212221 its reverse (1222121000011), we get a palindrome (2322122212232).

The spelling of 1100001212221 in words is "one trillion, one hundred billion, one million, two hundred twelve thousand, two hundred twenty-one".