21312553324342 has 8 divisors (see below), whose sum is σ = 36535805698896. Its totient is φ = 9133951424712.

The previous prime is 21312553324303. The next prime is 21312553324351. The reversal of 21312553324342 is 24342335521312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21312553324295 and 21312553324304.

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, 761162618713 + ... + 761162618740.

It is an arithmetic number, because the mean of its divisors is an integer number (4566975712362).

Almost surely, 2^{21312553324342} is an apocalyptic number.

21312553324342 is a deficient number, since it is larger than the sum of its proper divisors (15223252374554).

21312553324342 is a wasteful number, since it uses less digits than its factorization.

21312553324342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522325237462.

The product of its digits is 518400, while the sum is 40.

Adding to 21312553324342 its reverse (24342335521312), we get a palindrome (45654888845654).

The spelling of 21312553324342 in words is "twenty-one trillion, three hundred twelve billion, five hundred fifty-three million, three hundred twenty-four thousand, three hundred forty-two".