201021202202121 has 18 divisors (see below), whose sum is σ = 337770319347162. Its totient is φ = 114869258400960.

The previous prime is 201021202202069. The next prime is 201021202202137. The reversal of 201021202202121 is 121202202120102.

It is a happy number.

201021202202121 is a `hidden beast` number, since 20 + 1 + 0 + 212 + 0 + 220 + 212 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 199628330162121 + 1392872040000 = 14128989^2 + 1180200^2 .

It is not a de Polignac number, because 201021202202121 - 2¹⁰ = 201021202201097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201021202202094 and 201021202202103.

It is not an unprimeable number, because it can be changed into a prime (201021202202021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 227915194800 + ... + 227915195681.

It is an arithmetic number, because the mean of its divisors is an integer number (18765017741509).

Almost surely, 2^{201021202202121} is an apocalyptic number.

201021202202121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201021202202121 is a deficient number, since it is larger than the sum of its proper divisors (136749117145041).

201021202202121 is a wasteful number, since it uses less digits than its factorization.

201021202202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455830390501 (or 455830390491 counting only the distinct ones).

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

Adding to 201021202202121 its reverse (121202202120102), we get a palindrome (322223404322223).

The spelling of 201021202202121 in words is "two hundred one trillion, twenty-one billion, two hundred two million, two hundred two thousand, one hundred twenty-one".