21111200012 has 24 divisors (see below), whose sum is σ = 43584414720. Its totient is φ = 8755796880.

The previous prime is 21111199969. The next prime is 21111200039. The reversal of 21111200012 is 21000211112.

It is a junction number, because it is equal to n+sod(n) for n = 21111199966 and 21111200002.

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, 12159962 + ... + 12161697.

It is an arithmetic number, because the mean of its divisors is an integer number (1816017280).

Almost surely, 2^21111200012 is an apocalyptic number.

It is an amenable number.

21111200012 is an abundant number, since it is smaller than the sum of its proper divisors (22473214708).

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

21111200012 is a wasteful number, since it uses less digits than its factorization.

21111200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24321701 (or 24321699 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21111200012 its reverse (21000211112), we get a palindrome (42111411124).

The spelling of 21111200012 in words is "twenty-one billion, one hundred eleven million, two hundred thousand, twelve".