21011200012 has 24 divisors (see below), whose sum is σ = 40120012800. Its totient is φ = 9548706960.

The previous prime is 21011199991. The next prime is 21011200043. The reversal of 21011200012 is 21000211012.

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, 199989 + ... + 286387.

It is an arithmetic number, because the mean of its divisors is an integer number (1671667200).

Almost surely, 2^21011200012 is an apocalyptic number.

21011200012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011200012 is a deficient number, since it is larger than the sum of its proper divisors (19108812788).

21011200012 is a wasteful number, since it uses less digits than its factorization.

21011200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91941 (or 91939 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21011200012 its reverse (21000211012), we get a palindrome (42011411024).

The spelling of 21011200012 in words is "twenty-one billion, eleven million, two hundred thousand, twelve".