21530424123152 has 80 divisors (see below), whose sum is σ = 53135677491840. Its totient is φ = 8227459713024.

The previous prime is 21530424123151. The next prime is 21530424123179. The reversal of 21530424123152 is 25132142403512.

It is not an unprimeable number, because it can be changed into a prime (21530424123151) 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, 297542663 + ... + 297615014.

It is an arithmetic number, because the mean of its divisors is an integer number (664195968648).

Almost surely, 2^{21530424123152} is an apocalyptic number.

It is an amenable number.

21530424123152 is an abundant number, since it is smaller than the sum of its proper divisors (31605253368688).

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

21530424123152 is a wasteful number, since it uses less digits than its factorization.

21530424123152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595157728 (or 595157722 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21530424123152 its reverse (25132142403512), we get a palindrome (46662566526664).

The spelling of 21530424123152 in words is "twenty-one trillion, five hundred thirty billion, four hundred twenty-four million, one hundred twenty-three thousand, one hundred fifty-two".