21250222530 has 64 divisors (see below), whose sum is σ = 54496126080. Its totient is φ = 5284445184.

The previous prime is 21250222529. The next prime is 21250222579. The reversal of 21250222530 is 3522205212.

It is a self number, because there is not a number n which added to its sum of digits gives 21250222530.

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 31 ways as a sum of consecutive naturals, for example, 135544 + ... + 246723.

It is an arithmetic number, because the mean of its divisors is an integer number (851501970).

Almost surely, 2^21250222530 is an apocalyptic number.

21250222530 is an abundant number, since it is smaller than the sum of its proper divisors (33245903550).

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

21250222530 is a wasteful number, since it uses less digits than its factorization.

21250222530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382403.

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21250222530 its reverse (3522205212), we get a palindrome (24772427742).

The spelling of 21250222530 in words is "twenty-one billion, two hundred fifty million, two hundred twenty-two thousand, five hundred thirty".