21342405220 has 48 divisors (see below), whose sum is σ = 45036383616. Its totient is φ = 8495648000.

The previous prime is 21342405199. The next prime is 21342405239. The reversal of 21342405220 is 2250424312.

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, 5455065 + ... + 5458975.

It is an arithmetic number, because the mean of its divisors is an integer number (938257992).

Almost surely, 2^21342405220 is an apocalyptic number.

21342405220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21342405220 is an abundant number, since it is smaller than the sum of its proper divisors (23693978396).

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

21342405220 is a wasteful number, since it uses less digits than its factorization.

21342405220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172 (or 5170 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21342405220 its reverse (2250424312), we get a palindrome (23592829532).

The spelling of 21342405220 in words is "twenty-one billion, three hundred forty-two million, four hundred five thousand, two hundred twenty".