21002100110212 has 48 divisors (see below), whose sum is σ = 40946472504000. Its totient is φ = 9358858373760.

The previous prime is 21002100110203. The next prime is 21002100110213. The reversal of 21002100110212 is 21201100120012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21002100110192 and 21002100110201.

It is not an unprimeable number, because it can be changed into a prime (21002100110213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127040287 + ... + 127205497.

It is an arithmetic number, because the mean of its divisors is an integer number (853051510500).

Almost surely, 2^{21002100110212} is an apocalyptic number.

It is an amenable number.

21002100110212 is a deficient number, since it is larger than the sum of its proper divisors (19944372393788).

21002100110212 is a wasteful number, since it uses less digits than its factorization.

21002100110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249556 (or 249554 counting only the distinct ones).

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

Adding to 21002100110212 its reverse (21201100120012), we get a palindrome (42203200230224).

The spelling of 21002100110212 in words is "twenty-one trillion, two billion, one hundred million, one hundred ten thousand, two hundred twelve".