21210313312 has 24 divisors (see below), whose sum is σ = 41761048392. Its totient is φ = 10604332800.

The previous prime is 21210313283. The next prime is 21210313321. The reversal of 21210313312 is 21331301212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210313312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804987 + ... + 830917.

It is an arithmetic number, because the mean of its divisors is an integer number (1740043683).

Almost surely, 2^21210313312 is an apocalyptic number.

It is an amenable number.

21210313312 is a deficient number, since it is larger than the sum of its proper divisors (20550735080).

21210313312 is a wasteful number, since it uses less digits than its factorization.

21210313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51502 (or 51494 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21210313312 its reverse (21331301212), we get a palindrome (42541614524).

The spelling of 21210313312 in words is "twenty-one billion, two hundred ten million, three hundred thirteen thousand, three hundred twelve".