121111022221001 has 4 divisors (see below), whose sum is σ = 121121652533652. Its totient is φ = 121100391908352.

The previous prime is 121111022220997. The next prime is 121111022221009. The reversal of 121111022221001 is 100122220111121.

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 33747978108601 + 87363044112400 = 5809301^2 + 9346820^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111022221001 - 2² = 121111022220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111022221009) 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, 5315139236 + ... + 5315162021.

It is an arithmetic number, because the mean of its divisors is an integer number (30280413133413).

Almost surely, 2^{121111022221001} is an apocalyptic number.

It is an amenable number.

121111022221001 is a deficient number, since it is larger than the sum of its proper divisors (10630312651).

121111022221001 is a wasteful number, since it uses less digits than its factorization.

121111022221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10630312650.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121111022221001 its reverse (100122220111121), we get a palindrome (221233242332122).

The spelling of 121111022221001 in words is "one hundred twenty-one trillion, one hundred eleven billion, twenty-two million, two hundred twenty-one thousand, one".