21212002010 has 16 divisors (see below), whose sum is σ = 38704640616. Its totient is φ = 8368570368.

The previous prime is 21212002003. The next prime is 21212002013. The reversal of 21212002010 is 1020021212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12204283729 + 9007718281 = 110473^2 + 94909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21212001982 and 21212002000.

It is not an unprimeable number, because it can be changed into a prime (21212002013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14528039 + ... + 14529498.

Almost surely, 2^21212002010 is an apocalyptic number.

21212002010 is a deficient number, since it is larger than the sum of its proper divisors (17492638606).

21212002010 is a wasteful number, since it uses less digits than its factorization.

21212002010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29057617.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21212002010 its reverse (1020021212), we get a palindrome (22232023222).

The spelling of 21212002010 in words is "twenty-one billion, two hundred twelve million, two thousand, ten".