210211111201221 has 24 divisors (see below), whose sum is σ = 327794560871960. Its totient is φ = 129044398496256.

The previous prime is 210211111201093. The next prime is 210211111201237. The reversal of 210211111201221 is 122102111112012.

It is a happy number.

210211111201221 is a `hidden beast` number, since 21 + 0 + 211 + 1 + 11 + 201 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 69797854049121 + 140413257152100 = 8354511^2 + 11849610^2 .

It is not a de Polignac number, because 210211111201221 - 2⁷ = 210211111201093 is a prime.

It is a super-2 number, since 2×210211111201221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210211111201194 and 210211111201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211111201621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2196377776 + ... + 2196473481.

Almost surely, 2^{210211111201221} is an apocalyptic number.

It is an amenable number.

210211111201221 is a deficient number, since it is larger than the sum of its proper divisors (117583449670739).

210211111201221 is a wasteful number, since it uses less digits than its factorization.

210211111201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392851685 (or 4392851682 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 210211111201221 its reverse (122102111112012), we get a palindrome (332313222313233).

The spelling of 210211111201221 in words is "two hundred ten trillion, two hundred eleven billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".