1001100101221 has 4 divisors (see below), whose sum is σ = 1092109201344. Its totient is φ = 910091001100.

The previous prime is 1001100101213. The next prime is 1001100101227. The reversal of 1001100101221 is 1221010011001.

1001100101221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1001100101221 - 2³ = 1001100101213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001100101198 and 1001100101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001100101227) 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, 45504550045 + ... + 45504550066.

It is an arithmetic number, because the mean of its divisors is an integer number (273027300336).

Almost surely, 2^{1001100101221} is an apocalyptic number.

1001100101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001100101221 is a deficient number, since it is larger than the sum of its proper divisors (91009100123).

1001100101221 is an equidigital number, since it uses as much as digits as its factorization.

1001100101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91009100122.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001100101221 its reverse (1221010011001), we get a palindrome (2222110112222).

The spelling of 1001100101221 in words is "one trillion, one billion, one hundred million, one hundred one thousand, two hundred twenty-one".