21212001010111 has 2 divisors, whose sum is σ = 21212001010112. Its totient is φ = 21212001010110.

The previous prime is 21212001010103. The next prime is 21212001010133. The reversal of 21212001010111 is 11101010021212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212001010111 - 2³ = 21212001010103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212001010091 and 21212001010100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212001010171) 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 as a sum of consecutive naturals, namely, 10606000505055 + 10606000505056.

It is an arithmetic number, because the mean of its divisors is an integer number (10606000505056).

Almost surely, 2^{21212001010111} is an apocalyptic number.

21212001010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212001010111 is an equidigital number, since it uses as much as digits as its factorization.

21212001010111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21212001010111 its reverse (11101010021212), we get a palindrome (32313011031323).

The spelling of 21212001010111 in words is "twenty-one trillion, two hundred twelve billion, one million, ten thousand, one hundred eleven".