221243123442 has 64 divisors (see below), whose sum is σ = 508223600640. Its totient is φ = 63501595200.

The previous prime is 221243123407. The next prime is 221243123489. The reversal of 221243123442 is 244321342122.

221243123442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7146148 + ... + 7177040.

It is an arithmetic number, because the mean of its divisors is an integer number (7940993760).

Almost surely, 2^221243123442 is an apocalyptic number.

221243123442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221243123442 is an abundant number, since it is smaller than the sum of its proper divisors (286980477198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221243123442 is a wasteful number, since it uses less digits than its factorization.

221243123442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36639.

The product of its digits is 18432, while the sum is 30.

Adding to 221243123442 its reverse (244321342122), we get a palindrome (465564465564).

The spelling of 221243123442 in words is "two hundred twenty-one billion, two hundred forty-three million, one hundred twenty-three thousand, four hundred forty-two".