21530503100252 has 48 divisors (see below), whose sum is σ = 40035900996000. Its totient is φ = 10111899297024.

The previous prime is 21530503100231. The next prime is 21530503100261. The reversal of 21530503100252 is 25200130503512.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35879699 + ... + 36474837.

It is an arithmetic number, because the mean of its divisors is an integer number (834081270750).

Almost surely, 2^{21530503100252} is an apocalyptic number.

It is an amenable number.

21530503100252 is a deficient number, since it is larger than the sum of its proper divisors (18505397895748).

21530503100252 is a wasteful number, since it uses less digits than its factorization.

21530503100252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603638 (or 603636 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 21530503100252 its reverse (25200130503512), we get a palindrome (46730633603764).

The spelling of 21530503100252 in words is "twenty-one trillion, five hundred thirty billion, five hundred three million, one hundred thousand, two hundred fifty-two".