21120203312 has 40 divisors (see below), whose sum is σ = 46387499760. Its totient is φ = 9234743040.

The previous prime is 21120203303. The next prime is 21120203327. The reversal of 21120203312 is 21330202112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2668139 + ... + 2676042.

It is an arithmetic number, because the mean of its divisors is an integer number (1159687494).

Almost surely, 2^21120203312 is an apocalyptic number.

It is an amenable number.

21120203312 is an abundant number, since it is smaller than the sum of its proper divisors (25267296448).

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

21120203312 is a wasteful number, since it uses less digits than its factorization.

21120203312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5344221 (or 5344215 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120203312 its reverse (21330202112), we get a palindrome (42450405424).

The spelling of 21120203312 in words is "twenty-one billion, one hundred twenty million, two hundred three thousand, three hundred twelve".