1100121200021 has 4 divisors (see below), whose sum is σ = 1123528034112. Its totient is φ = 1076714365932.

The previous prime is 1100121199967. The next prime is 1100121200027. The reversal of 1100121200021 is 1200021210011.

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 not a de Polignac number, because 1100121200021 - 2²² = 1100117005717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1100121199975 and 1100121200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100121200027) 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, 11703416975 + ... + 11703417068.

It is an arithmetic number, because the mean of its divisors is an integer number (280882008528).

Almost surely, 2^{1100121200021} is an apocalyptic number.

It is an amenable number.

1100121200021 is a deficient number, since it is larger than the sum of its proper divisors (23406834091).

1100121200021 is an equidigital number, since it uses as much as digits as its factorization.

1100121200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23406834090.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1100121200021 its reverse (1200021210011), we get a palindrome (2300142410032).

The spelling of 1100121200021 in words is "one trillion, one hundred billion, one hundred twenty-one million, two hundred thousand, twenty-one".