21320210124 has 48 divisors (see below), whose sum is σ = 56450688000. Its totient is φ = 6955527888.

The previous prime is 21320210117. The next prime is 21320210209. The reversal of 21320210124 is 42101202312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21320210097 and 21320210106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2095024 + ... + 2105175.

It is an arithmetic number, because the mean of its divisors is an integer number (1176056000).

Almost surely, 2^21320210124 is an apocalyptic number.

It is an amenable number.

21320210124 is an abundant number, since it is smaller than the sum of its proper divisors (35130477876).

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

21320210124 is a wasteful number, since it uses less digits than its factorization.

21320210124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200259 (or 4200251 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21320210124 its reverse (42101202312), we get a palindrome (63421412436).

The spelling of 21320210124 in words is "twenty-one billion, three hundred twenty million, two hundred ten thousand, one hundred twenty-four".