21033312312 has 32 divisors (see below), whose sum is σ = 53065702800. Its totient is φ = 6946781184.

The previous prime is 21033312281. The next prime is 21033312329. The reversal of 21033312312 is 21321333012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4017513 + ... + 4022744.

Almost surely, 2^21033312312 is an apocalyptic number.

It is an amenable number.

21033312312 is an abundant number, since it is smaller than the sum of its proper divisors (32032390488).

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

21033312312 is a wasteful number, since it uses less digits than its factorization.

21033312312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040375 (or 8040371 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21033312312 its reverse (21321333012), we get a palindrome (42354645324).

The spelling of 21033312312 in words is "twenty-one billion, thirty-three million, three hundred twelve thousand, three hundred twelve".