21134242353 has 16 divisors (see below), whose sum is σ = 32224626560. Its totient is φ = 12069184896.

The previous prime is 21134242321. The next prime is 21134242373. The reversal of 21134242353 is 35324243112.

It is not a de Polignac number, because 21134242353 - 2⁵ = 21134242321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21134242353.

It is not an unprimeable number, because it can be changed into a prime (21134242313) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 278950 + ... + 346527.

It is an arithmetic number, because the mean of its divisors is an integer number (2014039160).

Almost surely, 2^21134242353 is an apocalyptic number.

It is an amenable number.

21134242353 is a deficient number, since it is larger than the sum of its proper divisors (11090384207).

21134242353 is a wasteful number, since it uses less digits than its factorization.

21134242353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627096.

The product of its digits is 17280, while the sum is 30.

Adding to 21134242353 its reverse (35324243112), we get a palindrome (56458485465).

The spelling of 21134242353 in words is "twenty-one billion, one hundred thirty-four million, two hundred forty-two thousand, three hundred fifty-three".