201423404442 has 64 divisors (see below), whose sum is σ = 444532064256. Its totient is φ = 60449072640.

The previous prime is 201423404411. The next prime is 201423404477. The reversal of 201423404442 is 244404324102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19640188 + ... + 19650440.

It is an arithmetic number, because the mean of its divisors is an integer number (6945813504).

Almost surely, 2^201423404442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201423404442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222266032128).

201423404442 is an abundant number, since it is smaller than the sum of its proper divisors (243108659814).

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

201423404442 is a wasteful number, since it uses less digits than its factorization.

201423404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16455.

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 201423404442 its reverse (244404324102), we get a palindrome (445827728544).

The spelling of 201423404442 in words is "two hundred one billion, four hundred twenty-three million, four hundred four thousand, four hundred forty-two".