21243024354 has 8 divisors (see below), whose sum is σ = 42486048720. Its totient is φ = 7081008116.

The previous prime is 21243024353. The next prime is 21243024359. The reversal of 21243024354 is 45342034212.

It is a sphenic number, since it is the product of 3 distinct primes.

21243024354 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21243024353) 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 3 ways as a sum of consecutive naturals, for example, 1770252024 + ... + 1770252035.

It is an arithmetic number, because the mean of its divisors is an integer number (5310756090).

Almost surely, 2^21243024354 is an apocalyptic number.

21243024354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21243024354 is a wasteful number, since it uses less digits than its factorization.

21243024354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540504064.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21243024354 its reverse (45342034212), we get a palindrome (66585058566).

The spelling of 21243024354 in words is "twenty-one billion, two hundred forty-three million, twenty-four thousand, three hundred fifty-four".