21011212120210 has 64 divisors (see below), whose sum is σ = 43138083510144. Its totient is φ = 7299465292800.

The previous prime is 21011212120187. The next prime is 21011212120229. The reversal of 21011212120210 is 1202121211012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6039745 + ... + 8860075.

It is an arithmetic number, because the mean of its divisors is an integer number (674032554846).

Almost surely, 2^{21011212120210} is an apocalyptic number.

21011212120210 is an abundant number, since it is smaller than the sum of its proper divisors (22126871389934).

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

21011212120210 is a wasteful number, since it uses less digits than its factorization.

21011212120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823739.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011212120210 its reverse (1202121211012), we get a palindrome (22213333331222).

The spelling of 21011212120210 in words is "twenty-one trillion, eleven billion, two hundred twelve million, one hundred twenty thousand, two hundred ten".