201210221210121 has 12 divisors (see below), whose sum is σ = 293514580116420. Its totient is φ = 132812027200800.

The previous prime is 201210221210101. The next prime is 201210221210123. The reversal of 201210221210121 is 121012122012102.

201210221210121 is a `hidden beast` number, since 2 + 0 + 1 + 210 + 221 + 210 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 167050170694521 + 34160050515600 = 12924789^2 + 5844660^2 .

It is not a de Polignac number, because 201210221210121 - 2¹³ = 201210221201929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201210221210094 and 201210221210103.

It is not an unprimeable number, because it can be changed into a prime (201210221210123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110676688426 + ... + 110676690243.

It is an arithmetic number, because the mean of its divisors is an integer number (24459548343035).

Almost surely, 2^{201210221210121} is an apocalyptic number.

It is an amenable number.

201210221210121 is a deficient number, since it is larger than the sum of its proper divisors (92304358906299).

201210221210121 is a wasteful number, since it uses less digits than its factorization.

201210221210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221353378776 (or 221353378773 counting only the distinct ones).

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

Adding to 201210221210121 its reverse (121012122012102), we get a palindrome (322222343222223).

The spelling of 201210221210121 in words is "two hundred one trillion, two hundred ten billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".