21211313312 has 24 divisors (see below), whose sum is σ = 47725455456. Its totient is φ = 9090562752.

The previous prime is 21211313251. The next prime is 21211313339. The reversal of 21211313312 is 21331311212.

It is a happy 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, 47346458 + ... + 47346905.

It is an arithmetic number, because the mean of its divisors is an integer number (1988560644).

Almost surely, 2^21211313312 is an apocalyptic number.

It is an amenable number.

21211313312 is an abundant number, since it is smaller than the sum of its proper divisors (26514142144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211313312 is an equidigital number, since it uses as much as digits as its factorization.

21211313312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94693380 (or 94693372 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 21211313312 its reverse (21331311212), we get a palindrome (42542624524).

The spelling of 21211313312 in words is "twenty-one billion, two hundred eleven million, three hundred thirteen thousand, three hundred twelve".