221000222210121 has 96 divisors (see below), whose sum is σ = 328411037300736. Its totient is φ = 143163049536000.

The previous prime is 221000222210113. The next prime is 221000222210231. The reversal of 221000222210121 is 121012222000122.

It is a happy number.

221000222210121 is a `hidden beast` number, since 2 + 210 + 0 + 0 + 222 + 210 + 1 + 21 = 666.

It is not a de Polignac number, because 221000222210121 - 2³ = 221000222210113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221000222210094 and 221000222210103.

It is not an unprimeable number, because it can be changed into a prime (221000222210321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 59875430886 + ... + 59875434576.

It is an arithmetic number, because the mean of its divisors is an integer number (3420948305216).

Almost surely, 2^{221000222210121} is an apocalyptic number.

It is an amenable number.

221000222210121 is a deficient number, since it is larger than the sum of its proper divisors (107410815090615).

221000222210121 is a wasteful number, since it uses less digits than its factorization.

221000222210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743 (or 7740 counting only the distinct ones).

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

Adding to 221000222210121 its reverse (121012222000122), we get a palindrome (342012444210243).

The spelling of 221000222210121 in words is "two hundred twenty-one trillion, two hundred twenty-two million, two hundred ten thousand, one hundred twenty-one".