202012220210121 has 24 divisors (see below), whose sum is σ = 292449999652200. Its totient is φ = 134372713660416.

The previous prime is 202012220210111. The next prime is 202012220210149. The reversal of 202012220210121 is 121012022210202.

It is a happy number.

202012220210121 is a `hidden beast` number, since 20 + 201 + 2 + 220 + 210 + 12 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 150326798400 + 201861893411721 = 387720^2 + 14207811^2 .

It is not a de Polignac number, because 202012220210121 - 2⁷ = 202012220209993 is a prime.

It is a super-2 number, since 2×202012220210121² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202012220210094 and 202012220210103.

It is not an unprimeable number, because it can be changed into a prime (202012220210111) 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, 274877665 + ... + 275611601.

It is an arithmetic number, because the mean of its divisors is an integer number (12185416652175).

Almost surely, 2^{202012220210121} is an apocalyptic number.

It is an amenable number.

202012220210121 is a deficient number, since it is larger than the sum of its proper divisors (90437779442079).

202012220210121 is a wasteful number, since it uses less digits than its factorization.

202012220210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802505 (or 802502 counting only the distinct ones).

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

Adding to 202012220210121 its reverse (121012022210202), we get a palindrome (323024242420323).

The spelling of 202012220210121 in words is "two hundred two trillion, twelve billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".