23201121312 has 72 divisors (see below), whose sum is σ = 69450741360. Its totient is φ = 7326668160.

The previous prime is 23201121301. The next prime is 23201121329. The reversal of 23201121312 is 21312110232.

23201121312 is a `hidden beast` number, since 2 + 320 + 11 + 21 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2114514 + ... + 2125457.

It is an arithmetic number, because the mean of its divisors is an integer number (964593630).

Almost surely, 2^23201121312 is an apocalyptic number.

It is an amenable number.

23201121312 is an abundant number, since it is smaller than the sum of its proper divisors (46249620048).

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

23201121312 is a wasteful number, since it uses less digits than its factorization.

23201121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240006 (or 4239995 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 23201121312 its reverse (21312110232), we get a palindrome (44513231544).

The spelling of 23201121312 in words is "twenty-three billion, two hundred one million, one hundred twenty-one thousand, three hundred twelve".