21000121100210 has 96 divisors (see below), whose sum is σ = 45630962019072. Its totient is φ = 6815504592000.

The previous prime is 21000121100141. The next prime is 21000121100221. The reversal of 21000121100210 is 1200112100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000121100191 and 21000121100200.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30565460 + ... + 31244960.

It is an arithmetic number, because the mean of its divisors is an integer number (475322521032).

Almost surely, 2^{21000121100210} is an apocalyptic number.

21000121100210 is an abundant number, since it is smaller than the sum of its proper divisors (24630840918862).

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

21000121100210 is a wasteful number, since it uses less digits than its factorization.

21000121100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680776 (or 680757 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000121100210 its reverse (1200112100012), we get a palindrome (22200233200222).

The spelling of 21000121100210 in words is "twenty-one trillion, one hundred twenty-one million, one hundred thousand, two hundred ten".