21242104104 has 32 divisors (see below), whose sum is σ = 57190281120. Its totient is φ = 6536031936.

The previous prime is 21242104099. The next prime is 21242104109. The reversal of 21242104104 is 40140124212.

It is an interprime number because it is at equal distance from previous prime (21242104099) and next prime (21242104109).

It is not an unprimeable number, because it can be changed into a prime (21242104109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34041522 + ... + 34042145.

It is an arithmetic number, because the mean of its divisors is an integer number (1787196285).

Almost surely, 2^21242104104 is an apocalyptic number.

21242104104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21242104104 is an abundant number, since it is smaller than the sum of its proper divisors (35948177016).

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

21242104104 is a wasteful number, since it uses less digits than its factorization.

21242104104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68083689 (or 68083685 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21242104104 its reverse (40140124212), we get a palindrome (61382228316).

The spelling of 21242104104 in words is "twenty-one billion, two hundred forty-two million, one hundred four thousand, one hundred four".