210101122111221 has 24 divisors (see below), whose sum is σ = 331137422553600. Its totient is φ = 127307479665600.

The previous prime is 210101122111207. The next prime is 210101122111267. The reversal of 210101122111221 is 122111221101012.

It is a happy number.

210101122111221 is a `hidden beast` number, since 210 + 1 + 0 + 1 + 1 + 221 + 11 + 221 = 666.

It is not a de Polignac number, because 210101122111221 - 2⁶ = 210101122111157 is a prime.

It is a super-2 number, since 2×210101122111221² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210101122111194 and 210101122111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101122111121) 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, 220636960 + ... + 221587161.

It is an arithmetic number, because the mean of its divisors is an integer number (13797392606400).

Almost surely, 2^{210101122111221} is an apocalyptic number.

It is an amenable number.

210101122111221 is a deficient number, since it is larger than the sum of its proper divisors (121036300442379).

210101122111221 is a wasteful number, since it uses less digits than its factorization.

210101122111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442228937 (or 442228934 counting only the distinct ones).

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

Adding to 210101122111221 its reverse (122111221101012), we get a palindrome (332212343212233).

The spelling of 210101122111221 in words is "two hundred ten trillion, one hundred one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".