21010120210002 has 64 divisors (see below), whose sum is σ = 52440284390400. Its totient is φ = 5451818537280.

The previous prime is 21010120209959. The next prime is 21010120210003. The reversal of 21010120210002 is 20001202101012.

It is a self number, because there is not a number n which added to its sum of digits gives 21010120210002.

It is not an unprimeable number, because it can be changed into a prime (21010120210003) 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, 21843477 + ... + 22785032.

It is an arithmetic number, because the mean of its divisors is an integer number (819379443600).

Almost surely, 2^{21010120210002} is an apocalyptic number.

21010120210002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010120210002 is an abundant number, since it is smaller than the sum of its proper divisors (31430164180398).

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

21010120210002 is a wasteful number, since it uses less digits than its factorization.

21010120210002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44629551.

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

Adding to 21010120210002 its reverse (20001202101012), we get a palindrome (41011322311014).

The spelling of 21010120210002 in words is "twenty-one trillion, ten billion, one hundred twenty million, two hundred ten thousand, two".