21000120200012 has 12 divisors (see below), whose sum is σ = 38911987429560. Its totient is φ = 9882409505856.

The previous prime is 21000120199987. The next prime is 21000120200057. The reversal of 21000120200012 is 21000202100012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21000120199966 and 21000120200002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154412648462 + ... + 154412648597.

It is an arithmetic number, because the mean of its divisors is an integer number (3242665619130).

Almost surely, 2^{21000120200012} is an apocalyptic number.

It is an amenable number.

21000120200012 is a deficient number, since it is larger than the sum of its proper divisors (17911867229548).

21000120200012 is a wasteful number, since it uses less digits than its factorization.

21000120200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308825297080 (or 308825297078 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21000120200012 its reverse (21000202100012), we get a palindrome (42000322300024).

The spelling of 21000120200012 in words is "twenty-one trillion, one hundred twenty million, two hundred thousand, twelve".