210111122001221 has 8 divisors (see below), whose sum is σ = 240127145706624. Its totient is φ = 180095135579280.

The previous prime is 210111122001091. The next prime is 210111122001233. The reversal of 210111122001221 is 122100221111012.

210111122001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210111122001221 - 2³⁸ = 209836244094277 is a prime.

It is a super-2 number, since 2×210111122001221² (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 210111122001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111122001721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4030136 + ... + 20891726.

It is an arithmetic number, because the mean of its divisors is an integer number (30015893213328).

Almost surely, 2^{210111122001221} is an apocalyptic number.

It is an amenable number.

210111122001221 is a deficient number, since it is larger than the sum of its proper divisors (30016023705403).

210111122001221 is a wasteful number, since it uses less digits than its factorization.

210111122001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18641731.

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

Adding to 210111122001221 its reverse (122100221111012), we get a palindrome (332211343112233).

The spelling of 210111122001221 in words is "two hundred ten trillion, one hundred eleven billion, one hundred twenty-two million, one thousand, two hundred twenty-one".