1001221121001 has 8 divisors (see below), whose sum is σ = 1393003298880. Its totient is φ = 638459845232.

The previous prime is 1001221120973. The next prime is 1001221121053. The reversal of 1001221121001 is 1001211221001.

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 1001221121001 - 2¹⁹ = 1001220596713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001221128001) 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, 7255225446 + ... + 7255225583.

It is an arithmetic number, because the mean of its divisors is an integer number (174125412360).

Almost surely, 2^{1001221121001} is an apocalyptic number.

It is an amenable number.

1001221121001 is a deficient number, since it is larger than the sum of its proper divisors (391782177879).

1001221121001 is a wasteful number, since it uses less digits than its factorization.

1001221121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14510451055.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001221121001 its reverse (1001211221001), we get a palindrome (2002432342002).

The spelling of 1001221121001 in words is "one trillion, one billion, two hundred twenty-one million, one hundred twenty-one thousand, one".