21220120210201 has 24 divisors (see below), whose sum is σ = 23481066821472. Its totient is φ = 19018020432000.

The previous prime is 21220120210199. The next prime is 21220120210207. The reversal of 21220120210201 is 10201202102212.

It is a happy number.

It is not a de Polignac number, because 21220120210201 - 2¹ = 21220120210199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220120210207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25739350 + ... + 26550976.

It is an arithmetic number, because the mean of its divisors is an integer number (978377784228).

Almost surely, 2^{21220120210201} is an apocalyptic number.

It is an amenable number.

21220120210201 is a deficient number, since it is larger than the sum of its proper divisors (2260946611271).

21220120210201 is a wasteful number, since it uses less digits than its factorization.

21220120210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812073 (or 811972 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220120210201 its reverse (10201202102212), we get a palindrome (31421322312413).

It can be divided in two parts, 212201 and 20210201, that added together give a palindrome (20422402).

The spelling of 21220120210201 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, two hundred ten thousand, two hundred one".