21012102100012 has 48 divisors (see below), whose sum is σ = 38883117540960. Its totient is φ = 9919962404352.

The previous prime is 21012102100009. The next prime is 21012102100027. The reversal of 21012102100012 is 21000120121012.

It is a super-2 number, since 2×21012102100012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012102099965 and 21012102100001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3678873 + ... + 7453744.

It is an arithmetic number, because the mean of its divisors is an integer number (810064948770).

Almost surely, 2^{21012102100012} is an apocalyptic number.

It is an amenable number.

21012102100012 is a deficient number, since it is larger than the sum of its proper divisors (17871015440948).

21012102100012 is a wasteful number, since it uses less digits than its factorization.

21012102100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11133010 (or 11133008 counting only the distinct ones).

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

Adding to 21012102100012 its reverse (21000120121012), we get a palindrome (42012222221024).

The spelling of 21012102100012 in words is "twenty-one trillion, twelve billion, one hundred two million, one hundred thousand, twelve".