2121202221101 has 4 divisors (see below), whose sum is σ = 2161224904572. Its totient is φ = 2081179537632.

The previous prime is 2121202221079. The next prime is 2121202221107. The reversal of 2121202221101 is 1011222021212.

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 649432903876 + 1471769317225 = 805874^2 + 1213165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121202221101 - 2¹⁴ = 2121202204717 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 2121202221101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121202221107) 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, 20011341656 + ... + 20011341761.

It is an arithmetic number, because the mean of its divisors is an integer number (540306226143).

Almost surely, 2^{2121202221101} is an apocalyptic number.

It is an amenable number.

2121202221101 is a deficient number, since it is larger than the sum of its proper divisors (40022683471).

2121202221101 is an equidigital number, since it uses as much as digits as its factorization.

2121202221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40022683470.

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

Adding to 2121202221101 its reverse (1011222021212), we get a palindrome (3132424242313).

The spelling of 2121202221101 in words is "two trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred one".