21011113312 has 48 divisors (see below), whose sum is σ = 47472929280. Its totient is φ = 8967063168.

The previous prime is 21011113303. The next prime is 21011113337. The reversal of 21011113312 is 21331111012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

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, 142698 + ... + 249769.

It is an arithmetic number, because the mean of its divisors is an integer number (989019360).

Almost surely, 2^21011113312 is an apocalyptic number.

It is an amenable number.

21011113312 is an abundant number, since it is smaller than the sum of its proper divisors (26461815968).

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

21011113312 is a wasteful number, since it uses less digits than its factorization.

21011113312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392723 (or 392715 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21011113312 its reverse (21331111012), we get a palindrome (42342224324).

The spelling of 21011113312 in words is "twenty-one billion, eleven million, one hundred thirteen thousand, three hundred twelve".