21210020100210 has 32 divisors (see below), whose sum is σ = 50905137892032. Its totient is φ = 5655884287680.

The previous prime is 21210020100151. The next prime is 21210020100289. The reversal of 21210020100210 is 1200102001212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6137764 + ... + 8949423.

It is an arithmetic number, because the mean of its divisors is an integer number (1590785559126).

Almost surely, 2^{21210020100210} is an apocalyptic number.

21210020100210 is an abundant number, since it is smaller than the sum of its proper divisors (29695117791822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210020100210 is a wasteful number, since it uses less digits than its factorization.

21210020100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15134058.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210020100210 its reverse (1200102001212), we get a palindrome (22410122101422).

The spelling of 21210020100210 in words is "twenty-one trillion, two hundred ten billion, twenty million, one hundred thousand, two hundred ten".