21201210100012 has 24 divisors (see below), whose sum is σ = 38533753681920. Its totient is φ = 10199211777360.

The previous prime is 21201210099997. The next prime is 21201210100039. The reversal of 21201210100012 is 21000101210212.

It is a junction number, because it is equal to n+sod(n) for n = 21201210099965 and 21201210100001.

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, 955687164 + ... + 955709347.

It is an arithmetic number, because the mean of its divisors is an integer number (1605573070080).

Almost surely, 2^{21201210100012} is an apocalyptic number.

It is an amenable number.

21201210100012 is a deficient number, since it is larger than the sum of its proper divisors (17332543581908).

21201210100012 is a wasteful number, since it uses less digits than its factorization.

21201210100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911396621 (or 1911396619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201210100012 its reverse (21000101210212), we get a palindrome (42201311310224).

The spelling of 21201210100012 in words is "twenty-one trillion, two hundred one billion, two hundred ten million, one hundred thousand, twelve".