201210210111221 has 4 divisors (see below), whose sum is σ = 201210749354412. Its totient is φ = 201209670868032.

The previous prime is 201210210111181. The next prime is 201210210111269. The reversal of 201210210111221 is 122111012012102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40278506506225 + 160931703604996 = 6346535^2 + 12685886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201210210111221 is a prime.

It is a super-2 number, since 2×201210210111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201210210111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210210131221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269061506 + ... + 269808291.

It is an arithmetic number, because the mean of its divisors is an integer number (50302687338603).

Almost surely, 2^{201210210111221} is an apocalyptic number.

It is an amenable number.

201210210111221 is a deficient number, since it is larger than the sum of its proper divisors (539243191).

201210210111221 is an equidigital number, since it uses as much as digits as its factorization.

201210210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539243190.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201210210111221 its reverse (122111012012102), we get a palindrome (323321222123323).

The spelling of 201210210111221 in words is "two hundred one trillion, two hundred ten billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".