21224203154 has 16 divisors (see below), whose sum is σ = 39692016576. Its totient is φ = 8269170000.

The previous prime is 21224203127. The next prime is 21224203159. The reversal of 21224203154 is 45130242212.

It is not an unprimeable number, because it can be changed into a prime (21224203159) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 68909597 + ... + 68909904.

It is an arithmetic number, because the mean of its divisors is an integer number (2480751036).

Almost surely, 2^21224203154 is an apocalyptic number.

21224203154 is a deficient number, since it is larger than the sum of its proper divisors (18467813422).

21224203154 is a wasteful number, since it uses less digits than its factorization.

21224203154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137819521.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21224203154 its reverse (45130242212), we get a palindrome (66354445366).

The spelling of 21224203154 in words is "twenty-one billion, two hundred twenty-four million, two hundred three thousand, one hundred fifty-four".