221022122121 has 32 divisors (see below), whose sum is σ = 334632960000. Its totient is φ = 144115569360.

The previous prime is 221022122077. The next prime is 221022122129. The reversal of 221022122121 is 121221220122.

It is a happy number.

221022122121 is a `hidden beast` number, since 221 + 0 + 221 + 221 + 2 + 1 = 666.

It is not a de Polignac number, because 221022122121 - 2⁷ = 221022121993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221022122094 and 221022122103.

It is not an unprimeable number, because it can be changed into a prime (221022122129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1844136 + ... + 1960326.

It is an arithmetic number, because the mean of its divisors is an integer number (10457280000).

Almost surely, 2^221022122121 is an apocalyptic number.

It is an amenable number.

221022122121 is a deficient number, since it is larger than the sum of its proper divisors (113610837879).

221022122121 is a wasteful number, since it uses less digits than its factorization.

221022122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117746 (or 117740 counting only the distinct ones).

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

Adding to 221022122121 its reverse (121221220122), we get a palindrome (342243342243).

The spelling of 221022122121 in words is "two hundred twenty-one billion, twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".