21510051024252 has 144 divisors (see below), whose sum is σ = 60521723458560. Its totient is φ = 5921620483968.

The previous prime is 21510051024233. The next prime is 21510051024323. The reversal of 21510051024252 is 25242015001512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7009213 + ... + 9599435.

It is an arithmetic number, because the mean of its divisors is an integer number (420289746240).

Almost surely, 2^{21510051024252} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21510051024252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30260861729280).

21510051024252 is an abundant number, since it is smaller than the sum of its proper divisors (39011672434308).

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

21510051024252 is a wasteful number, since it uses less digits than its factorization.

21510051024252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590760 (or 2590751 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 21510051024252 its reverse (25242015001512), we get a palindrome (46752066025764).

The spelling of 21510051024252 in words is "twenty-one trillion, five hundred ten billion, fifty-one million, twenty-four thousand, two hundred fifty-two".