21242554540 has 48 divisors (see below), whose sum is σ = 44786294784. Its totient is φ = 8463384000.

The previous prime is 21242554517. The next prime is 21242554547. The reversal of 21242554540 is 4545524212.

It is a super-2 number, since 2×21242554540² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21242554496 and 21242554505.

It is not an unprimeable number, because it can be changed into a prime (21242554547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9034365 + ... + 9036715.

It is an arithmetic number, because the mean of its divisors is an integer number (933047808).

Almost surely, 2^21242554540 is an apocalyptic number.

21242554540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242554540 is an abundant number, since it is smaller than the sum of its proper divisors (23543740244).

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

21242554540 is a wasteful number, since it uses less digits than its factorization.

21242554540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958 (or 3956 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 34.

The spelling of 21242554540 in words is "twenty-one billion, two hundred forty-two million, five hundred fifty-four thousand, five hundred forty".