21504340122 has 16 divisors (see below), whose sum is σ = 43012120800. Its totient is φ = 7167539952.

The previous prime is 21504340079. The next prime is 21504340133. The reversal of 21504340122 is 22104340512.

It is a junction number, because it is equal to n+sod(n) for n = 21504340092 and 21504340101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58213 + ... + 215400.

It is an arithmetic number, because the mean of its divisors is an integer number (2688257550).

Almost surely, 2^21504340122 is an apocalyptic number.

21504340122 is an abundant number, since it is smaller than the sum of its proper divisors (21507780678).

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

21504340122 is a wasteful number, since it uses less digits than its factorization.

21504340122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286717.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21504340122 its reverse (22104340512), we get a palindrome (43608680634).

The spelling of 21504340122 in words is "twenty-one billion, five hundred four million, three hundred forty thousand, one hundred twenty-two".