21530013153 has 48 divisors (see below), whose sum is σ = 33339801600. Its totient is φ = 12315045600.

The previous prime is 21530013149. The next prime is 21530013157. The reversal of 21530013153 is 35131003512.

It is an interprime number because it is at equal distance from previous prime (21530013149) and next prime (21530013157).

It is not a de Polignac number, because 21530013153 - 2² = 21530013149 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21530013157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1863328 + ... + 1874846.

It is an arithmetic number, because the mean of its divisors is an integer number (694579200).

Almost surely, 2^21530013153 is an apocalyptic number.

It is an amenable number.

21530013153 is a deficient number, since it is larger than the sum of its proper divisors (11809788447).

21530013153 is a wasteful number, since it uses less digits than its factorization.

21530013153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11834 (or 11823 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 24.

Adding to 21530013153 its reverse (35131003512), we get a palindrome (56661016665).

The spelling of 21530013153 in words is "twenty-one billion, five hundred thirty million, thirteen thousand, one hundred fifty-three".