21525030312 has 64 divisors (see below), whose sum is σ = 55814400000. Its totient is φ = 6911942400.

The previous prime is 21525030283. The next prime is 21525030323. The reversal of 21525030312 is 21303052512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 30312 + ... + 209687.

It is an arithmetic number, because the mean of its divisors is an integer number (872100000).

Almost surely, 2^21525030312 is an apocalyptic number.

It is an amenable number.

21525030312 is an abundant number, since it is smaller than the sum of its proper divisors (34289369688).

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

21525030312 is a wasteful number, since it uses less digits than its factorization.

21525030312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240146 (or 240142 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21525030312 its reverse (21303052512), we get a palindrome (42828082824).

The spelling of 21525030312 in words is "twenty-one billion, five hundred twenty-five million, thirty thousand, three hundred twelve".