21724437225740 has 24 divisors (see below), whose sum is σ = 45850571037600. Its totient is φ = 8646107678208.

The previous prime is 21724437225703. The next prime is 21724437225749. The reversal of 21724437225740 is 4752273442712.

It is not an unprimeable number, because it can be changed into a prime (21724437225749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2729196677 + ... + 2729204636.

It is an arithmetic number, because the mean of its divisors is an integer number (1910440459900).

Almost surely, 2^{21724437225740} is an apocalyptic number.

21724437225740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21724437225740 is an abundant number, since it is smaller than the sum of its proper divisors (24126133811860).

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

21724437225740 is a wasteful number, since it uses less digits than its factorization.

21724437225740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458401521 (or 5458401519 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 50.

The spelling of 21724437225740 in words is "twenty-one trillion, seven hundred twenty-four billion, four hundred thirty-seven million, two hundred twenty-five thousand, seven hundred forty".