201210011221221 has 32 divisors (see below), whose sum is σ = 316944147801600. Its totient is φ = 125721178490880.

The previous prime is 201210011221181. The next prime is 201210011221231. The reversal of 201210011221221 is 122122110012102.

201210011221221 is a `hidden beast` number, since 2 + 0 + 1 + 210 + 0 + 11 + 221 + 221 = 666.

It is not a de Polignac number, because 201210011221221 - 2¹⁷ = 201210011090149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201210011221194 and 201210011221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210011221231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 916974060 + ... + 917193461.

It is an arithmetic number, because the mean of its divisors is an integer number (9904504618800).

Almost surely, 2^{201210011221221} is an apocalyptic number.

It is an amenable number.

201210011221221 is a deficient number, since it is larger than the sum of its proper divisors (115734136580379).

201210011221221 is a wasteful number, since it uses less digits than its factorization.

201210011221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834167786 (or 1834167780 counting only the distinct ones).

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

Adding to 201210011221221 its reverse (122122110012102), we get a palindrome (323332121233323).

The spelling of 201210011221221 in words is "two hundred one trillion, two hundred ten billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".