21201313312 has 48 divisors (see below), whose sum is σ = 42168796992. Its totient is φ = 10492330240.

The previous prime is 21201313303. The next prime is 21201313319. The reversal of 21201313312 is 21331310212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201313312.

It is not an unprimeable number, because it can be changed into a prime (21201313319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248237 + ... + 1265107.

It is an arithmetic number, because the mean of its divisors is an integer number (878516604).

Almost surely, 2^21201313312 is an apocalyptic number.

It is an amenable number.

21201313312 is a deficient number, since it is larger than the sum of its proper divisors (20967483680).

21201313312 is a wasteful number, since it uses less digits than its factorization.

21201313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17281 (or 17273 counting only the distinct ones).

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

Adding to 21201313312 its reverse (21331310212), we get a palindrome (42532623524).

The spelling of 21201313312 in words is "twenty-one billion, two hundred one million, three hundred thirteen thousand, three hundred twelve".