21222154024 has 16 divisors (see below), whose sum is σ = 40638168000. Its totient is φ = 10385309232.

The previous prime is 21222153961. The next prime is 21222154043. The reversal of 21222154024 is 42045122212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222154024.

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 3 ways as a sum of consecutive naturals, for example, 28220574 + ... + 28221325.

It is an arithmetic number, because the mean of its divisors is an integer number (2539885500).

Almost surely, 2^21222154024 is an apocalyptic number.

It is an amenable number.

21222154024 is a deficient number, since it is larger than the sum of its proper divisors (19416013976).

21222154024 is a wasteful number, since it uses less digits than its factorization.

21222154024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56441952 (or 56441948 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21222154024 its reverse (42045122212), we get a palindrome (63267276236).

The spelling of 21222154024 in words is "twenty-one billion, two hundred twenty-two million, one hundred fifty-four thousand, twenty-four".