21210122312 has 32 divisors (see below), whose sum is σ = 41436360000. Its totient is φ = 10165689408.

The previous prime is 21210122257. The next prime is 21210122317. The reversal of 21210122312 is 21322101212.

It is not an unprimeable number, because it can be changed into a prime (21210122317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296612 + ... + 361107.

It is an arithmetic number, because the mean of its divisors is an integer number (1294886250).

Almost surely, 2^21210122312 is an apocalyptic number.

It is an amenable number.

21210122312 is a deficient number, since it is larger than the sum of its proper divisors (20226237688).

21210122312 is a wasteful number, since it uses less digits than its factorization.

21210122312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657893 (or 657889 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21210122312 its reverse (21322101212), we get a palindrome (42532223524).

The spelling of 21210122312 in words is "twenty-one billion, two hundred ten million, one hundred twenty-two thousand, three hundred twelve".