21600223124 has 12 divisors (see below), whose sum is σ = 37808032500. Its totient is φ = 10797928128.

The previous prime is 21600223111. The next prime is 21600223129. The reversal of 21600223124 is 42132200612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7000334224 + 14599888900 = 83668^2 + 120830^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21600223124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600223129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523499 + ... + 563250.

It is an arithmetic number, because the mean of its divisors is an integer number (3150669375).

Almost surely, 2^21600223124 is an apocalyptic number.

It is an amenable number.

21600223124 is a deficient number, since it is larger than the sum of its proper divisors (16207809376).

21600223124 is a wasteful number, since it uses less digits than its factorization.

21600223124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091722 (or 1091720 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21600223124 its reverse (42132200612), we get a palindrome (63732423736).

The spelling of 21600223124 in words is "twenty-one billion, six hundred million, two hundred twenty-three thousand, one hundred twenty-four".