21001323111312 has 40 divisors (see below), whose sum is σ = 54253764726304. Its totient is φ = 7000396303104.

The previous prime is 21001323111299. The next prime is 21001323111323. The reversal of 21001323111312 is 21311132310012.

It is a super-2 number, since 2×21001323111312² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6672123 + ... + 9301605.

Almost surely, 2^{21001323111312} is an apocalyptic number.

It is an amenable number.

21001323111312 is an abundant number, since it is smaller than the sum of its proper divisors (33252441614992).

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

21001323111312 is a wasteful number, since it uses less digits than its factorization.

21001323111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795887 (or 2795881 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21001323111312 its reverse (21311132310012), we get a palindrome (42312455421324).

The spelling of 21001323111312 in words is "twenty-one trillion, one billion, three hundred twenty-three million, one hundred eleven thousand, three hundred twelve".