21212010110 has 16 divisors (see below), whose sum is σ = 38345492016. Its totient is φ = 8448387648.

The previous prime is 21212010097. The next prime is 21212010119. The reversal of 21212010110 is 1101021212.

It is a junction number, because it is equal to n+sod(n) for n = 21212010091 and 21212010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212010119) 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, 4549604 + ... + 4554263.

It is an arithmetic number, because the mean of its divisors is an integer number (2396593251).

Almost surely, 2^21212010110 is an apocalyptic number.

21212010110 is a deficient number, since it is larger than the sum of its proper divisors (17133481906).

21212010110 is a wasteful number, since it uses less digits than its factorization.

21212010110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104107.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21212010110 its reverse (1101021212), we get a palindrome (22313031322).

The spelling of 21212010110 in words is "twenty-one billion, two hundred twelve million, ten thousand, one hundred ten".