21344031220 has 24 divisors (see below), whose sum is σ = 44846500608. Its totient is φ = 8533034400.

The previous prime is 21344031187. The next prime is 21344031227. The reversal of 21344031220 is 2213044312.

It is a junction number, because it is equal to n+sod(n) for n = 21344031191 and 21344031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344031227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247776 + ... + 322615.

It is an arithmetic number, because the mean of its divisors is an integer number (1868604192).

Almost surely, 2^21344031220 is an apocalyptic number.

21344031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344031220 is an abundant number, since it is smaller than the sum of its proper divisors (23502469388).

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

21344031220 is a wasteful number, since it uses less digits than its factorization.

21344031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572271 (or 572269 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21344031220 its reverse (2213044312), we get a palindrome (23557075532).

The spelling of 21344031220 in words is "twenty-one billion, three hundred forty-four million, thirty-one thousand, two hundred twenty".