1100211212221 has 4 divisors (see below), whose sum is σ = 1200230413344. Its totient is φ = 1000192011100.

The previous prime is 1100211212129. The next prime is 1100211212273. The reversal of 1100211212221 is 1222121120011.

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 a de Polignac number, because none of the positive numbers 2^k-1100211212221 is a prime.

It is a super-2 number, since 2×1100211212221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100211212195 and 1100211212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100211212521) 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, 50009600545 + ... + 50009600566.

It is an arithmetic number, because the mean of its divisors is an integer number (300057603336).

Almost surely, 2^{1100211212221} is an apocalyptic number.

1100211212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100211212221 is a deficient number, since it is larger than the sum of its proper divisors (100019201123).

1100211212221 is a wasteful number, since it uses less digits than its factorization.

1100211212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100019201122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1100211212221 its reverse (1222121120011), we get a palindrome (2322332332232).

The spelling of 1100211212221 in words is "one trillion, one hundred billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-one".