21688143213 has 32 divisors (see below), whose sum is σ = 32833327104. Its totient is φ = 12720246000.

The previous prime is 21688143163. The next prime is 21688143241. The reversal of 21688143213 is 31234188612.

It is not a de Polignac number, because 21688143213 - 2¹² = 21688139117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21688143263) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 36178 + ... + 211388.

It is an arithmetic number, because the mean of its divisors is an integer number (1026041472).

Almost surely, 2^21688143213 is an apocalyptic number.

It is an amenable number.

21688143213 is a deficient number, since it is larger than the sum of its proper divisors (11145183891).

21688143213 is a wasteful number, since it uses less digits than its factorization.

21688143213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175278 (or 175256 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The spelling of 21688143213 in words is "twenty-one billion, six hundred eighty-eight million, one hundred forty-three thousand, two hundred thirteen".