21021210010210 has 24 divisors (see below), whose sum is σ = 38175992667540. Its totient is φ = 8334072590592.

The previous prime is 21021210010169. The next prime is 21021210010249. The reversal of 21021210010210 is 1201001212012.

It can be written as a sum of positive squares in 6 ways, for example, as 402517920249 + 20618692089961 = 634443^2 + 4540781^2 .

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 11 ways as a sum of consecutive naturals, for example, 82185765 + ... + 82441144.

Almost surely, 2^{21021210010210} is an apocalyptic number.

21021210010210 is a deficient number, since it is larger than the sum of its proper divisors (17154782657330).

21021210010210 is a wasteful number, since it uses less digits than its factorization.

21021210010210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164627142 (or 164627029 counting only the distinct ones).

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

Adding to 21021210010210 its reverse (1201001212012), we get a palindrome (22222211222222).

The spelling of 21021210010210 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, ten thousand, two hundred ten".