21124234120 has 64 divisors (see below), whose sum is σ = 52700466240. Its totient is φ = 7555603200.

The previous prime is 21124234111. The next prime is 21124234127. The reversal of 21124234120 is 2143242112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21124234091 and 21124234100.

It is not an unprimeable number, because it can be changed into a prime (21124234127) 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 15 ways as a sum of consecutive naturals, for example, 366682 + ... + 420361.

It is an arithmetic number, because the mean of its divisors is an integer number (823444785).

Almost surely, 2^21124234120 is an apocalyptic number.

21124234120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124234120 is an abundant number, since it is smaller than the sum of its proper divisors (31576232120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124234120 is a wasteful number, since it uses less digits than its factorization.

21124234120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787126 (or 787122 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21124234120 its reverse (2143242112), we get a palindrome (23267476232).

The spelling of 21124234120 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-four thousand, one hundred twenty".