21110020121212 has 24 divisors (see below), whose sum is σ = 40308974404272. Its totient is φ = 9593552524800.

The previous prime is 21110020121159. The next prime is 21110020121219. The reversal of 21110020121212 is 21212102001112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110020121219) 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, 47555733 + ... + 47997580.

It is an arithmetic number, because the mean of its divisors is an integer number (1679540600178).

Almost surely, 2^{21110020121212} is an apocalyptic number.

21110020121212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21110020121212 is a deficient number, since it is larger than the sum of its proper divisors (19198954283060).

21110020121212 is a wasteful number, since it uses less digits than its factorization.

21110020121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95558349 (or 95558347 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21110020121212 its reverse (21212102001112), we get a palindrome (42322122122324).

The spelling of 21110020121212 in words is "twenty-one trillion, one hundred ten billion, twenty million, one hundred twenty-one thousand, two hundred twelve".