21102103242 has 96 divisors (see below), whose sum is σ = 50266884096. Its totient is φ = 6344906400.

The previous prime is 21102103177. The next prime is 21102103291. The reversal of 21102103242 is 24230120112.

It is a happy number.

21102103242 is a `hidden beast` number, since 211 + 0 + 210 + 3 + 242 = 666.

21102103242 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21102103242² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16194363 + ... + 16195665.

It is an arithmetic number, because the mean of its divisors is an integer number (523613376).

Almost surely, 2^21102103242 is an apocalyptic number.

21102103242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102103242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25133442048).

21102103242 is an abundant number, since it is smaller than the sum of its proper divisors (29164780854).

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

21102103242 is a wasteful number, since it uses less digits than its factorization.

21102103242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896 (or 1893 counting only the distinct ones).

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

Adding to 21102103242 its reverse (24230120112), we get a palindrome (45332223354).

The spelling of 21102103242 in words is "twenty-one billion, one hundred two million, one hundred three thousand, two hundred forty-two".