2121201222101 has 8 divisors (see below), whose sum is σ = 2284635399480. Its totient is φ = 1957804880832.

The previous prime is 2121201222079. The next prime is 2121201222113. The reversal of 2121201222101 is 1012221021212.

It can be written as a sum of positive squares in 4 ways, for example, as 547305519601 + 1573895702500 = 739801^2 + 1254550^2 .

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 2121201222101 - 2²² = 2121197027797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121201222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201222181) 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, 9342530 + ... + 9566883.

It is an arithmetic number, because the mean of its divisors is an integer number (285579424935).

Almost surely, 2^{2121201222101} is an apocalyptic number.

It is an amenable number.

2121201222101 is a deficient number, since it is larger than the sum of its proper divisors (163434177379).

2121201222101 is a wasteful number, since it uses less digits than its factorization.

2121201222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18918055.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2121201222101 its reverse (1012221021212), we get a palindrome (3133422243313).

The spelling of 2121201222101 in words is "two trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty-two thousand, one hundred one".