21002112220210 has 64 divisors (see below), whose sum is σ = 41557595616000. Its totient is φ = 7578511916800.

The previous prime is 21002112220169. The next prime is 21002112220241. The reversal of 21002112220210 is 1202221120012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16276656 + ... + 17519524.

It is an arithmetic number, because the mean of its divisors is an integer number (649337431500).

Almost surely, 2^{21002112220210} is an apocalyptic number.

21002112220210 is a deficient number, since it is larger than the sum of its proper divisors (20555483395790).

21002112220210 is a wasteful number, since it uses less digits than its factorization.

21002112220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244067.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002112220210 its reverse (1202221120012), we get a palindrome (22204333340222).

The spelling of 21002112220210 in words is "twenty-one trillion, two billion, one hundred twelve million, two hundred twenty thousand, two hundred ten".