21212101010122 has 64 divisors (see below), whose sum is σ = 35689627759104. Its totient is φ = 9372193669440.

The previous prime is 21212101010053. The next prime is 21212101010123. The reversal of 21212101010122 is 22101010121212.

It is a super-3 number, since 3×21212101010122³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212101010096 and 21212101010105.

It is not an unprimeable number, because it can be changed into a prime (21212101010123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216659793 + ... + 216757675.

It is an arithmetic number, because the mean of its divisors is an integer number (557650433736).

Almost surely, 2^{21212101010122} is an apocalyptic number.

21212101010122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212101010122 is a deficient number, since it is larger than the sum of its proper divisors (14477526748982).

21212101010122 is a wasteful number, since it uses less digits than its factorization.

21212101010122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99043.

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

Adding to 21212101010122 its reverse (22101010121212), we get a palindrome (43313111131334).

The spelling of 21212101010122 in words is "twenty-one trillion, two hundred twelve billion, one hundred one million, ten thousand, one hundred twenty-two".