21212110100010 has 32 divisors (see below), whose sum is σ = 50909397921792. Its totient is φ = 5656525617600.

The previous prime is 21212110099949. The next prime is 21212110100017. The reversal of 21212110100010 is 1000101121212.

It is a super-3 number, since 3×21212110100010³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21212110100017) 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, 2500272 + ... + 6976788.

It is an arithmetic number, because the mean of its divisors is an integer number (1590918685056).

Almost surely, 2^{21212110100010} is an apocalyptic number.

21212110100010 is an abundant number, since it is smaller than the sum of its proper divisors (29697287821782).

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

21212110100010 is a wasteful number, since it uses less digits than its factorization.

21212110100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4634478.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21212110100010 its reverse (1000101121212), we get a palindrome (22212211221222).

The spelling of 21212110100010 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten million, one hundred thousand, ten".