222221002100121 has 24 divisors (see below), whose sum is σ = 329661999226560. Its totient is φ = 144142997263776.

The previous prime is 222221002100101. The next prime is 222221002100129. The reversal of 222221002100121 is 121001200122222.

It is a happy number.

222221002100121 is a `hidden beast` number, since 2 + 222 + 210 + 0 + 210 + 0 + 1 + 21 = 666.

It is not a de Polignac number, because 222221002100121 - 2⁶ = 222221002100057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221002100094 and 222221002100103.

It is not an unprimeable number, because it can be changed into a prime (222221002100129) 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, 240784276 + ... + 241705418.

It is an arithmetic number, because the mean of its divisors is an integer number (13735916634440).

Almost surely, 2^{222221002100121} is an apocalyptic number.

It is an amenable number.

222221002100121 is a deficient number, since it is larger than the sum of its proper divisors (107440997126439).

222221002100121 is a wasteful number, since it uses less digits than its factorization.

222221002100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645645 (or 1645642 counting only the distinct ones).

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

Adding to 222221002100121 its reverse (121001200122222), we get a palindrome (343222202222343).

The spelling of 222221002100121 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, two million, one hundred thousand, one hundred twenty-one".