21020222121201 has 48 divisors (see below), whose sum is σ = 30837847339728. Its totient is φ = 13795778304000.

The previous prime is 21020222121163. The next prime is 21020222121233. The reversal of 21020222121201 is 10212122202012.

It is a happy number.

21020222121201 is a `hidden beast` number, since 21 + 0 + 202 + 221 + 21 + 201 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 5058990608400 + 15961231512801 = 2249220^2 + 3995151^2 .

It is not a de Polignac number, because 21020222121201 - 2¹⁸ = 21020221859057 is a prime.

It is a super-3 number, since 3×21020222121201³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020222122201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296688541 + ... + 296759381.

It is an arithmetic number, because the mean of its divisors is an integer number (642455152911).

Almost surely, 2^{21020222121201} is an apocalyptic number.

It is an amenable number.

21020222121201 is a deficient number, since it is larger than the sum of its proper divisors (9817625218527).

21020222121201 is a wasteful number, since it uses less digits than its factorization.

21020222121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72802 (or 72799 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21020222121201 its reverse (10212122202012), we get a palindrome (31232344323213).

The spelling of 21020222121201 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred one".