21420103124 has 24 divisors (see below), whose sum is σ = 43321561920. Its totient is φ = 9076896576.

The previous prime is 21420103057. The next prime is 21420103127. The reversal of 21420103124 is 42130102412.

It is a junction number, because it is equal to n+sod(n) for n = 21420103096 and 21420103105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420103127) 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, 4295282 + ... + 4300265.

It is an arithmetic number, because the mean of its divisors is an integer number (1805065080).

Almost surely, 2^21420103124 is an apocalyptic number.

It is an amenable number.

21420103124 is an abundant number, since it is smaller than the sum of its proper divisors (21901458796).

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

21420103124 is a wasteful number, since it uses less digits than its factorization.

21420103124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595647 (or 8595645 counting only the distinct ones).

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

Adding to 21420103124 its reverse (42130102412), we get a palindrome (63550205536).

The spelling of 21420103124 in words is "twenty-one billion, four hundred twenty million, one hundred three thousand, one hundred twenty-four".