21312011234 has 8 divisors (see below), whose sum is σ = 32016528720. Its totient is φ = 10639834996.

The previous prime is 21312011233. The next prime is 21312011239. The reversal of 21312011234 is 43211021312.

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

It is not an unprimeable number, because it can be changed into a prime (21312011233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8083664 + ... + 8086299.

It is an arithmetic number, because the mean of its divisors is an integer number (4002066090).

Almost surely, 2^21312011234 is an apocalyptic number.

21312011234 is a deficient number, since it is larger than the sum of its proper divisors (10704517486).

21312011234 is a wasteful number, since it uses less digits than its factorization.

21312011234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16170624.

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

Adding to 21312011234 its reverse (43211021312), we get a palindrome (64523032546).

The spelling of 21312011234 in words is "twenty-one billion, three hundred twelve million, eleven thousand, two hundred thirty-four".