21212021110 has 96 divisors (see below), whose sum is σ = 45549852768. Its totient is φ = 7089223680.

The previous prime is 21212021071. The next prime is 21212021123. The reversal of 21212021110 is 1112021212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3181180 + ... + 3187840.

It is an arithmetic number, because the mean of its divisors is an integer number (474477633).

Almost surely, 2^21212021110 is an apocalyptic number.

21212021110 is an abundant number, since it is smaller than the sum of its proper divisors (24337831658).

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

21212021110 is a wasteful number, since it uses less digits than its factorization.

21212021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6846 (or 6839 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212021110 its reverse (1112021212), we get a palindrome (22324042322).

The spelling of 21212021110 in words is "twenty-one billion, two hundred twelve million, twenty-one thousand, one hundred ten".