21312343214 has 32 divisors (see below), whose sum is σ = 33513480000. Its totient is φ = 10145608704.

The previous prime is 21312343207. The next prime is 21312343231. The reversal of 21312343214 is 41234321312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14913452 + ... + 14914880.

It is an arithmetic number, because the mean of its divisors is an integer number (1047296250).

Almost surely, 2^21312343214 is an apocalyptic number.

21312343214 is a deficient number, since it is larger than the sum of its proper divisors (12201136786).

21312343214 is a wasteful number, since it uses less digits than its factorization.

21312343214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732.

The product of its digits is 3456, while the sum is 26.

Adding to 21312343214 its reverse (41234321312), we get a palindrome (62546664526).

The spelling of 21312343214 in words is "twenty-one billion, three hundred twelve million, three hundred forty-three thousand, two hundred fourteen".