21023111012 has 6 divisors (see below), whose sum is σ = 36790444278. Its totient is φ = 10511555504.

The previous prime is 21023111009. The next prime is 21023111077. The reversal of 21023111012 is 21011132012.

It can be written as a sum of positive squares in only one way, i.e., 20396409856 + 626701156 = 142816^2 + 25034^2 .

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 as a sum of consecutive naturals, namely, 2627888873 + ... + 2627888880.

It is an arithmetic number, because the mean of its divisors is an integer number (6131740713).

Almost surely, 2^21023111012 is an apocalyptic number.

It is an amenable number.

21023111012 is a deficient number, since it is larger than the sum of its proper divisors (15767333266).

21023111012 is a wasteful number, since it uses less digits than its factorization.

21023111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255777757 (or 5255777755 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21023111012 its reverse (21011132012), we get a palindrome (42034243024).

The spelling of 21023111012 in words is "twenty-one billion, twenty-three million, one hundred eleven thousand, twelve".