221242242123 has 24 divisors (see below), whose sum is σ = 365285496576. Its totient is φ = 126403297200.

The previous prime is 221242242079. The next prime is 221242242161. The reversal of 221242242123 is 321242242122.

221242242123 is a `hidden beast` number, since 2 + 21 + 2 + 422 + 4 + 212 + 3 = 666.

It is not a de Polignac number, because 221242242123 - 2⁶ = 221242242059 is a prime.

It is a super-2 number, since 2×221242242123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221242241123) 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, 99858 + ... + 672648.

It is an arithmetic number, because the mean of its divisors is an integer number (15220229024).

Almost surely, 2^221242242123 is an apocalyptic number.

221242242123 is a deficient number, since it is larger than the sum of its proper divisors (144043254453).

221242242123 is a wasteful number, since it uses less digits than its factorization.

221242242123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578935 (or 578932 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

Adding to 221242242123 its reverse (321242242122), we get a palindrome (542484484245).

Subtracting 221242242123 from its reverse (321242242122), we obtain a palindrome (99999999999).

The spelling of 221242242123 in words is "two hundred twenty-one billion, two hundred forty-two million, two hundred forty-two thousand, one hundred twenty-three".