21212011002111 has 4 divisors (see below), whose sum is σ = 28282681336152. Its totient is φ = 14141340668072.

The previous prime is 21212011002109. The next prime is 21212011002187. The reversal of 21212011002111 is 11120011021212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212011002111 - 2¹ = 21212011002109 is a prime.

It is a super-2 number, since 2×21212011002111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212011002311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535335167016 + ... + 3535335167021.

It is an arithmetic number, because the mean of its divisors is an integer number (7070670334038).

Almost surely, 2^{21212011002111} is an apocalyptic number.

21212011002111 is a deficient number, since it is larger than the sum of its proper divisors (7070670334041).

21212011002111 is an equidigital number, since it uses as much as digits as its factorization.

21212011002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070670334040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21212011002111 its reverse (11120011021212), we get a palindrome (32332022023323).

The spelling of 21212011002111 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two thousand, one hundred eleven".