21212220210010 has 16 divisors (see below), whose sum is σ = 38190820582656. Its totient is φ = 8482927149648.

The previous prime is 21212220210001. The next prime is 21212220210011. The reversal of 21212220210010 is 1001202221212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21212220210011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245071362 + ... + 245157901.

It is an arithmetic number, because the mean of its divisors is an integer number (2386926286416).

Almost surely, 2^{21212220210010} is an apocalyptic number.

21212220210010 is a deficient number, since it is larger than the sum of its proper divisors (16978600372646).

21212220210010 is a wasteful number, since it uses less digits than its factorization.

21212220210010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490233597.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212220210010 its reverse (1001202221212), we get a palindrome (22213422431222).

The spelling of 21212220210010 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred ten thousand, ten".