21531200530 has 32 divisors (see below), whose sum is σ = 44299293696. Its totient is φ = 7381036224.

The previous prime is 21531200491. The next prime is 21531200549. The reversal of 21531200530 is 3500213512.

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, 561532 + ... + 598648.

It is an arithmetic number, because the mean of its divisors is an integer number (1384352928).

Almost surely, 2^21531200530 is an apocalyptic number.

21531200530 is an abundant number, since it is smaller than the sum of its proper divisors (22768093166).

21531200530 is a wasteful number, since it uses less digits than its factorization.

21531200530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45418.

The product of its (nonzero) digits is 900, while the sum is 22.

The spelling of 21531200530 in words is "twenty-one billion, five hundred thirty-one million, two hundred thousand, five hundred thirty".