21531353253124 has 48 divisors (see below), whose sum is σ = 44827602865920. Its totient is φ = 8919778083840.

The previous prime is 21531353253083. The next prime is 21531353253161. The reversal of 21531353253124 is 42135235313512.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 238196749 + ... + 238287124.

It is an arithmetic number, because the mean of its divisors is an integer number (933908393040).

Almost surely, 2^{21531353253124} is an apocalyptic number.

It is an amenable number.

21531353253124 is an abundant number, since it is smaller than the sum of its proper divisors (23296249612796).

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

21531353253124 is a wasteful number, since it uses less digits than its factorization.

21531353253124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476483980 (or 476483978 counting only the distinct ones).

The product of its digits is 324000, while the sum is 40.

Adding to 21531353253124 its reverse (42135235313512), we get a palindrome (63666588566636).

The spelling of 21531353253124 in words is "twenty-one trillion, five hundred thirty-one billion, three hundred fifty-three million, two hundred fifty-three thousand, one hundred twenty-four".