21224032505252 has 12 divisors (see below), whose sum is σ = 37696415942640. Its totient is φ = 10453627950216.

The previous prime is 21224032505251. The next prime is 21224032505281. The reversal of 21224032505252 is 25250523042212.

It is not an unprimeable number, because it can be changed into a prime (21224032505251) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 39597075302 + ... + 39597075837.

It is an arithmetic number, because the mean of its divisors is an integer number (3141367995220).

Almost surely, 2^{21224032505252} is an apocalyptic number.

It is an amenable number.

21224032505252 is a deficient number, since it is larger than the sum of its proper divisors (16472383437388).

21224032505252 is a wasteful number, since it uses less digits than its factorization.

21224032505252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79194151210 (or 79194151208 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 21224032505252 its reverse (25250523042212), we get a palindrome (46474555547464).

The spelling of 21224032505252 in words is "twenty-one trillion, two hundred twenty-four billion, thirty-two million, five hundred five thousand, two hundred fifty-two".