21216351236342 has 8 divisors (see below), whose sum is σ = 33208201935216. Its totient is φ = 10146950591272.

The previous prime is 21216351236299. The next prime is 21216351236359. The reversal of 21216351236342 is 24363215361212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21216351236342.

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, 230612513393 + ... + 230612513484.

It is an arithmetic number, because the mean of its divisors is an integer number (4151025241902).

Almost surely, 2^{21216351236342} is an apocalyptic number.

21216351236342 is a deficient number, since it is larger than the sum of its proper divisors (11991850698874).

21216351236342 is a wasteful number, since it uses less digits than its factorization.

21216351236342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461225026902.

The product of its digits is 311040, while the sum is 41.

Adding to 21216351236342 its reverse (24363215361212), we get a palindrome (45579566597554).

The spelling of 21216351236342 in words is "twenty-one trillion, two hundred sixteen billion, three hundred fifty-one million, two hundred thirty-six thousand, three hundred forty-two".