21000120210210 has 32 divisors (see below), whose sum is σ = 50400949686912. Its totient is φ = 5599958591360.

The previous prime is 21000120210163. The next prime is 21000120210211. The reversal of 21000120210210 is 1201202100012.

It is not an unprimeable number, because it can be changed into a prime (21000120210211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2246979 + ... + 6859238.

It is an arithmetic number, because the mean of its divisors is an integer number (1575029677716).

Almost surely, 2^{21000120210210} is an apocalyptic number.

21000120210210 is an abundant number, since it is smaller than the sum of its proper divisors (29400829476702).

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

21000120210210 is a wasteful number, since it uses less digits than its factorization.

21000120210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9183098.

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

Adding to 21000120210210 its reverse (1201202100012), we get a palindrome (22201322310222).

The spelling of 21000120210210 in words is "twenty-one trillion, one hundred twenty million, two hundred ten thousand, two hundred ten".