221211112112221 has 32 divisors (see below), whose sum is σ = 281752616927232. Its totient is φ = 168651521180160.

The previous prime is 221211112112147. The next prime is 221211112112233. The reversal of 221211112112221 is 122211211112122.

It is a cyclic number.

It is not a de Polignac number, because 221211112112221 - 2¹¹ = 221211112110173 is a prime.

It is a super-2 number, since 2×221211112112221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221211112112192 and 221211112112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211112110221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1811085 + ... + 21111661.

It is an arithmetic number, because the mean of its divisors is an integer number (8804769278976).

Almost surely, 2^{221211112112221} is an apocalyptic number.

It is an amenable number.

221211112112221 is a deficient number, since it is larger than the sum of its proper divisors (60541504815011).

221211112112221 is a wasteful number, since it uses less digits than its factorization.

221211112112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19303809.

The product of its digits is 128, while the sum is 22.

Adding to 221211112112221 its reverse (122211211112122), we get a palindrome (343422323224343).

The spelling of 221211112112221 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".