21000012100210 has 64 divisors (see below), whose sum is σ = 44775429277824. Its totient is φ = 7048955052480.

The previous prime is 21000012100181. The next prime is 21000012100213. The reversal of 21000012100210 is 1200121000012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21000012100213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60510124 + ... + 60856183.

It is an arithmetic number, because the mean of its divisors is an integer number (699616082466).

Almost surely, 2^{21000012100210} is an apocalyptic number.

21000012100210 is an abundant number, since it is smaller than the sum of its proper divisors (23775417177614).

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

21000012100210 is a wasteful number, since it uses less digits than its factorization.

21000012100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121366360 (or 121366338 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000012100210 its reverse (1200121000012), we get a palindrome (22200133100222).

The spelling of 21000012100210 in words is "twenty-one trillion, twelve million, one hundred thousand, two hundred ten".