21102012100012 has 24 divisors (see below), whose sum is σ = 36935520947136. Its totient is φ = 10549006343568.

The previous prime is 21102012100007. The next prime is 21102012100019. The reversal of 21102012100012 is 21000121020112.

It is a junction number, because it is equal to n+sod(n) for n = 21102012099965 and 21102012100001.

It is not an unprimeable number, because it can be changed into a prime (21102012100019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737740903 + ... + 737769505.

It is an arithmetic number, because the mean of its divisors is an integer number (1538980039464).

Almost surely, 2^{21102012100012} is an apocalyptic number.

It is an amenable number.

21102012100012 is a deficient number, since it is larger than the sum of its proper divisors (15833508847124).

21102012100012 is a wasteful number, since it uses less digits than its factorization.

21102012100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57117 (or 57115 counting only the distinct ones).

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

Adding to 21102012100012 its reverse (21000121020112), we get a palindrome (42102133120124).

The spelling of 21102012100012 in words is "twenty-one trillion, one hundred two billion, twelve million, one hundred thousand, twelve".