1001221121101 has 32 divisors (see below), whose sum is σ = 1082725816320. Its totient is φ = 923026104000.

The previous prime is 1001221121099. The next prime is 1001221121111. The reversal of 1001221121101 is 1011211221001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1001221121101 - 2¹ = 1001221121099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221121111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31965090 + ... + 31996396.

It is an arithmetic number, because the mean of its divisors is an integer number (33835181760).

Almost surely, 2^{1001221121101} is an apocalyptic number.

It is an amenable number.

1001221121101 is a deficient number, since it is larger than the sum of its proper divisors (81504695219).

1001221121101 is a wasteful number, since it uses less digits than its factorization.

1001221121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31705.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1001221121101 its reverse (1011211221001), we get a palindrome (2012432342102).

The spelling of 1001221121101 in words is "one trillion, one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".