21343124040 has 96 divisors (see below), whose sum is σ = 74483167680. Its totient is φ = 4878427008.

The previous prime is 21343124021. The next prime is 21343124053. The reversal of 21343124040 is 4042134312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21343124040.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1809012 + ... + 1820771.

It is an arithmetic number, because the mean of its divisors is an integer number (775866330).

Almost surely, 2^21343124040 is an apocalyptic number.

21343124040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343124040 is an abundant number, since it is smaller than the sum of its proper divisors (53140043640).

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

21343124040 is a wasteful number, since it uses less digits than its factorization.

21343124040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629811 (or 3629800 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21343124040 its reverse (4042134312), we get a palindrome (25385258352).

The spelling of 21343124040 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-four thousand, forty".