121001101221001 has 4 divisors (see below), whose sum is σ = 121001123321604. Its totient is φ = 121001079120400.

The previous prime is 121001101220981. The next prime is 121001101221019. The reversal of 121001101221001 is 100122101100121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38802870348025 + 82198230872976 = 6229195^2 + 9066324^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001101221001 - 2²⁹ = 121000564350089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121001101221101) 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, 3946191 + ... + 16049131.

It is an arithmetic number, because the mean of its divisors is an integer number (30250280830401).

Almost surely, 2^{121001101221001} is an apocalyptic number.

It is an amenable number.

121001101221001 is a deficient number, since it is larger than the sum of its proper divisors (22100603).

121001101221001 is an equidigital number, since it uses as much as digits as its factorization.

121001101221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22100602.

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

Adding to 121001101221001 its reverse (100122101100121), we get a palindrome (221123202321122).

The spelling of 121001101221001 in words is "one hundred twenty-one trillion, one billion, one hundred one million, two hundred twenty-one thousand, one".