21212012012111 has 8 divisors (see below), whose sum is σ = 21783018339264. Its totient is φ = 20645992640160.

The previous prime is 21212012012099. The next prime is 21212012012141. The reversal of 21212012012111 is 11121021021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212012012111 - 2³⁰ = 21210938270287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212012012111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212012012141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246730180 + ... + 1246747193.

It is an arithmetic number, because the mean of its divisors is an integer number (2722877292408).

Almost surely, 2^{21212012012111} is an apocalyptic number.

21212012012111 is a deficient number, since it is larger than the sum of its proper divisors (571006327153).

21212012012111 is a wasteful number, since it uses less digits than its factorization.

21212012012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493477601.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21212012012111 its reverse (11121021021212), we get a palindrome (32333033033323).

The spelling of 21212012012111 in words is "twenty-one trillion, two hundred twelve billion, twelve million, twelve thousand, one hundred eleven".