21210321134 has 8 divisors (see below), whose sum is σ = 31823017560. Its totient is φ = 10602648616.

The previous prime is 21210321127. The next prime is 21210321157. The reversal of 21210321134 is 43112301212.

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

It is a congruent number.

It is an unprimeable number.

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, 1245404 + ... + 1262319.

It is an arithmetic number, because the mean of its divisors is an integer number (3977877195).

Almost surely, 2^21210321134 is an apocalyptic number.

21210321134 is a deficient number, since it is larger than the sum of its proper divisors (10612696426).

21210321134 is a wasteful number, since it uses less digits than its factorization.

21210321134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511954.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21210321134 its reverse (43112301212), we get a palindrome (64322622346).

The spelling of 21210321134 in words is "twenty-one billion, two hundred ten million, three hundred twenty-one thousand, one hundred thirty-four".