21543304342 has 8 divisors (see below), whose sum is σ = 36931378896. Its totient is φ = 9232844712.

The previous prime is 21543304333. The next prime is 21543304357. The reversal of 21543304342 is 24340334512.

It is a happy number.

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

It is a super-2 number, since 2×21543304342² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769403713 + ... + 769403740.

It is an arithmetic number, because the mean of its divisors is an integer number (4616422362).

Almost surely, 2^21543304342 is an apocalyptic number.

21543304342 is a deficient number, since it is larger than the sum of its proper divisors (15388074554).

21543304342 is a wasteful number, since it uses less digits than its factorization.

21543304342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538807462.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21543304342 its reverse (24340334512), we get a palindrome (45883638854).

The spelling of 21543304342 in words is "twenty-one billion, five hundred forty-three million, three hundred four thousand, three hundred forty-two".