21100124432 has 40 divisors (see below), whose sum is σ = 41336547000. Its totient is φ = 10432806912.

The previous prime is 21100124389. The next prime is 21100124443. The reversal of 21100124432 is 23442100112.

It can be written as a sum of positive squares in 4 ways, for example, as 795014416 + 20305110016 = 28196^2 + 142496^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181944 + ... + 2191592.

It is an arithmetic number, because the mean of its divisors is an integer number (1033413675).

Almost surely, 2^21100124432 is an apocalyptic number.

It is an amenable number.

21100124432 is a deficient number, since it is larger than the sum of its proper divisors (20236422568).

21100124432 is a wasteful number, since it uses less digits than its factorization.

21100124432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11163 (or 11157 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21100124432 its reverse (23442100112), we get a palindrome (44542224544).

The spelling of 21100124432 in words is "twenty-one billion, one hundred million, one hundred twenty-four thousand, four hundred thirty-two".