221120112111221 has 2 divisors, whose sum is σ = 221120112111222. Its totient is φ = 221120112111220.

The previous prime is 221120112111187. The next prime is 221120112111229. The reversal of 221120112111221 is 122111211021122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220867570684996 + 252541426225 = 14861614^2 + 502535^2 .

It is a cyclic number.

It is not a de Polignac number, because 221120112111221 - 2¹⁰ = 221120112110197 is a prime.

It is a super-2 number, since 2×221120112111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221120112111193 and 221120112111202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221120112111229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560056055610 + 110560056055611.

It is an arithmetic number, because the mean of its divisors is an integer number (110560056055611).

Almost surely, 2^{221120112111221} is an apocalyptic number.

It is an amenable number.

221120112111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221120112111221 is an equidigital number, since it uses as much as digits as its factorization.

221120112111221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221120112111221 its reverse (122111211021122), we get a palindrome (343231323132343).

The spelling of 221120112111221 in words is "two hundred twenty-one trillion, one hundred twenty billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".