221122012221 has 12 divisors (see below), whose sum is σ = 348434686080. Its totient is φ = 134013340680.

The previous prime is 221122012183. The next prime is 221122012261. The reversal of 221122012221 is 122210221122.

It is a happy number.

221122012221 is a `hidden beast` number, since 2 + 211 + 220 + 12 + 221 = 666.

It is not a de Polignac number, because 221122012221 - 2⁷ = 221122012093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221122012194 and 221122012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122012261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1116777741 + ... + 1116777938.

It is an arithmetic number, because the mean of its divisors is an integer number (29036223840).

Almost surely, 2^221122012221 is an apocalyptic number.

It is an amenable number.

221122012221 is a deficient number, since it is larger than the sum of its proper divisors (127312673859).

221122012221 is a wasteful number, since it uses less digits than its factorization.

221122012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233555696 (or 2233555693 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221122012221 its reverse (122210221122), we get a palindrome (343332233343).

The spelling of 221122012221 in words is "two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-one".