21323420124 has 24 divisors (see below), whose sum is σ = 51099368208. Its totient is φ = 6915703680.

The previous prime is 21323420123. The next prime is 21323420171. The reversal of 21323420124 is 42102432312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21323420094 and 21323420103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323420123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24012417 + ... + 24013304.

It is an arithmetic number, because the mean of its divisors is an integer number (2129140342).

Almost surely, 2^21323420124 is an apocalyptic number.

It is an amenable number.

21323420124 is an abundant number, since it is smaller than the sum of its proper divisors (29775948084).

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

21323420124 is a wasteful number, since it uses less digits than its factorization.

21323420124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48025765 (or 48025763 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21323420124 its reverse (42102432312), we get a palindrome (63425852436).

The spelling of 21323420124 in words is "twenty-one billion, three hundred twenty-three million, four hundred twenty thousand, one hundred twenty-four".