201123223440 has 80 divisors (see below), whose sum is σ = 636747602688. Its totient is φ = 52491731968.

The previous prime is 201123223423. The next prime is 201123223451. The reversal of 201123223440 is 44322321102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 201123223440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8903757 + ... + 8926316.

Almost surely, 2^201123223440 is an apocalyptic number.

201123223440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201123223440 is an abundant number, since it is smaller than the sum of its proper divisors (435624379248).

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

201123223440 is a wasteful number, since it uses less digits than its factorization.

201123223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17830136 (or 17830130 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 201123223440 its reverse (44322321102), we get a palindrome (245445544542).

The spelling of 201123223440 in words is "two hundred one billion, one hundred twenty-three million, two hundred twenty-three thousand, four hundred forty".