21010212101204 has 12 divisors (see below), whose sum is σ = 36767919654228. Its totient is φ = 10505092200000.

The previous prime is 21010212101201. The next prime is 21010212101227. The reversal of 21010212101204 is 40210121201012.

It can be written as a sum of positive squares in 2 ways, for example, as 16919220436804 + 4090991664400 = 4113298^2 + 2022620^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010212101201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438854 + ... + 6497154.

It is an arithmetic number, because the mean of its divisors is an integer number (3063993304519).

Almost surely, 2^{21010212101204} is an apocalyptic number.

It is an amenable number.

21010212101204 is a deficient number, since it is larger than the sum of its proper divisors (15757707553024).

21010212101204 is a wasteful number, since it uses less digits than its factorization.

21010212101204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6925306 (or 6925304 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21010212101204 its reverse (40210121201012), we get a palindrome (61220333302216).

The spelling of 21010212101204 in words is "twenty-one trillion, ten billion, two hundred twelve million, one hundred one thousand, two hundred four".