21323131112 has 8 divisors (see below), whose sum is σ = 39980870850. Its totient is φ = 10661565552.

The previous prime is 21323131103. The next prime is 21323131133. The reversal of 21323131112 is 21113132312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18075726916 + 3247404196 = 134446^2 + 56986^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1332695687 + ... + 1332695702.

Almost surely, 2^21323131112 is an apocalyptic number.

It is an amenable number.

21323131112 is a deficient number, since it is larger than the sum of its proper divisors (18657739738).

21323131112 is a wasteful number, since it uses less digits than its factorization.

21323131112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665391395 (or 2665391391 counting only the distinct ones).

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

Adding to 21323131112 its reverse (21113132312), we get a palindrome (42436263424).

The spelling of 21323131112 in words is "twenty-one billion, three hundred twenty-three million, one hundred thirty-one thousand, one hundred twelve".