20201101222121 has 4 divisors (see below), whose sum is σ = 20201137830612. Its totient is φ = 20201064613632.

The previous prime is 20201101222103. The next prime is 20201101222199. The reversal of 20201101222121 is 12122210110202.

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 19356163390096 + 844937832025 = 4399564^2 + 919205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201101222121 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 20201101222121.

It is not an unprimeable number, because it can be changed into a prime (20201101222721) 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, 17463656 + ... + 18584441.

It is an arithmetic number, because the mean of its divisors is an integer number (5050284457653).

Almost surely, 2^{20201101222121} is an apocalyptic number.

It is an amenable number.

20201101222121 is a deficient number, since it is larger than the sum of its proper divisors (36608491).

20201101222121 is an equidigital number, since it uses as much as digits as its factorization.

20201101222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36608490.

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

Adding to 20201101222121 its reverse (12122210110202), we get a palindrome (32323311332323).

The spelling of 20201101222121 in words is "twenty trillion, two hundred one billion, one hundred one million, two hundred twenty-two thousand, one hundred twenty-one".