21343240220 has 48 divisors (see below), whose sum is σ = 46303488000. Its totient is φ = 8255319360.

The previous prime is 21343240201. The next prime is 21343240277. The reversal of 21343240220 is 2204234312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804731 + ... + 830829.

It is an arithmetic number, because the mean of its divisors is an integer number (964656000).

Almost surely, 2^21343240220 is an apocalyptic number.

21343240220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21343240220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23151744000).

21343240220 is an abundant number, since it is smaller than the sum of its proper divisors (24960247780).

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

21343240220 is a wasteful number, since it uses less digits than its factorization.

21343240220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27458 (or 27456 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21343240220 its reverse (2204234312), we get a palindrome (23547474532).

The spelling of 21343240220 in words is "twenty-one billion, three hundred forty-three million, two hundred forty thousand, two hundred twenty".