21042242235 has 128 divisors (see below), whose sum is σ = 46192896000. Its totient is φ = 9053130240.

The previous prime is 21042242219. The next prime is 21042242311. The reversal of 21042242235 is 53224224012.

21042242235 is a `hidden beast` number, since 2 + 1 + 0 + 422 + 4 + 2 + 235 = 666.

It is not a de Polignac number, because 21042242235 - 2⁴ = 21042242219 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21042242199 and 21042242208.

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 127 ways as a sum of consecutive naturals, for example, 773820 + ... + 800550.

It is an arithmetic number, because the mean of its divisors is an integer number (360882000).

Almost surely, 2^21042242235 is an apocalyptic number.

21042242235 is an abundant number, since it is smaller than the sum of its proper divisors (25150653765).

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

21042242235 is a wasteful number, since it uses less digits than its factorization.

21042242235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26783 (or 26763 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21042242235 its reverse (53224224012), we get a palindrome (74266466247).

The spelling of 21042242235 in words is "twenty-one billion, forty-two million, two hundred forty-two thousand, two hundred thirty-five".