21212102020011 has 32 divisors (see below), whose sum is σ = 32718202449408. Its totient is φ = 11973126063360.

The previous prime is 21212102019989. The next prime is 21212102020079. The reversal of 21212102020011 is 11002020121212.

It is not a de Polignac number, because 21212102020011 - 2¹⁵ = 21212101987243 is a prime.

It is a super-3 number, since 3×21212102020011³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212102020111) 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, 9246601 + ... + 11310341.

It is an arithmetic number, because the mean of its divisors is an integer number (1022443826544).

Almost surely, 2^{21212102020011} is an apocalyptic number.

21212102020011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21212102020011 is a deficient number, since it is larger than the sum of its proper divisors (11506100429397).

21212102020011 is a wasteful number, since it uses less digits than its factorization.

21212102020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069731.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212102020011 its reverse (11002020121212), we get a palindrome (32214122141223).

The spelling of 21212102020011 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, twenty thousand, eleven".