21120043303242 has 128 divisors (see below), whose sum is σ = 53520033208320. Its totient is φ = 6115848053760.

The previous prime is 21120043303237. The next prime is 21120043303273. The reversal of 21120043303242 is 24230334002112.

21120043303242 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 0 + 0 + 4 + 330 + 324 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 250846392 + ... + 250930572.

It is an arithmetic number, because the mean of its divisors is an integer number (418125259440).

Almost surely, 2^{21120043303242} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120043303242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26760016604160).

21120043303242 is an abundant number, since it is smaller than the sum of its proper divisors (32399989905078).

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

21120043303242 is a wasteful number, since it uses less digits than its factorization.

21120043303242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105245 (or 105239 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21120043303242 its reverse (24230334002112), we get a palindrome (45350377305354).

The spelling of 21120043303242 in words is "twenty-one trillion, one hundred twenty billion, forty-three million, three hundred three thousand, two hundred forty-two".