21100021200212 has 6 divisors (see below), whose sum is σ = 36925037100378. Its totient is φ = 10550010600104.

The previous prime is 21100021200187. The next prime is 21100021200259. The reversal of 21100021200212 is 21200212000112.

It can be written as a sum of positive squares in only one way, i.e., 21035486910916 + 64534289296 = 4586446^2 + 254036^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637502650023 + ... + 2637502650030.

It is an arithmetic number, because the mean of its divisors is an integer number (6154172850063).

Almost surely, 2^{21100021200212} is an apocalyptic number.

It is an amenable number.

21100021200212 is a deficient number, since it is larger than the sum of its proper divisors (15825015900166).

21100021200212 is a wasteful number, since it uses less digits than its factorization.

21100021200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275005300057 (or 5275005300055 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21100021200212 its reverse (21200212000112), we get a palindrome (42300233200324).

The spelling of 21100021200212 in words is "twenty-one trillion, one hundred billion, twenty-one million, two hundred thousand, two hundred twelve".