201021210212121 has 24 divisors (see below), whose sum is σ = 313062000765696. Its totient is φ = 123562016661600.

The previous prime is 201021210212099. The next prime is 201021210212143. The reversal of 201021210212121 is 121212012120102.

201021210212121 is a `hidden beast` number, since 20 + 102 + 1 + 210 + 212 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (201021210212099) and next prime (201021210212143).

It is not a de Polignac number, because 201021210212121 - 2¹⁷ = 201021210081049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201021210212094 and 201021210212103.

It is not an unprimeable number, because it can be changed into a prime (201021210212021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 995339355 + ... + 995541296.

It is an arithmetic number, because the mean of its divisors is an integer number (13044250031904).

Almost surely, 2^{201021210212121} is an apocalyptic number.

It is an amenable number.

201021210212121 is a deficient number, since it is larger than the sum of its proper divisors (112040790553575).

201021210212121 is a wasteful number, since it uses less digits than its factorization.

201021210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990881533 (or 1990881530 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 201021210212121 its reverse (121212012120102), we get a palindrome (322233222332223).

The spelling of 201021210212121 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".