21212012110 has 16 divisors (see below), whose sum is σ = 40191181200. Its totient is φ = 8038236096.

The previous prime is 21212012069. The next prime is 21212012141. The reversal of 21212012110 is 1121021212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55820895 + ... + 55821274.

It is an arithmetic number, because the mean of its divisors is an integer number (2511948825).

Almost surely, 2^21212012110 is an apocalyptic number.

21212012110 is a deficient number, since it is larger than the sum of its proper divisors (18979169090).

21212012110 is a wasteful number, since it uses less digits than its factorization.

21212012110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111642195.

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

Adding to 21212012110 its reverse (1121021212), we get a palindrome (22333033322).

The spelling of 21212012110 in words is "twenty-one billion, two hundred twelve million, twelve thousand, one hundred ten".