21202102111 has 2 divisors, whose sum is σ = 21202102112. Its totient is φ = 21202102110.

The previous prime is 21202102099. The next prime is 21202102153. The reversal of 21202102111 is 11120120212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202102111 - 2¹³ = 21202093919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202102091 and 21202102100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202106111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601051055 + 10601051056.

It is an arithmetic number, because the mean of its divisors is an integer number (10601051056).

Almost surely, 2^21202102111 is an apocalyptic number.

21202102111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202102111 is an equidigital number, since it uses as much as digits as its factorization.

21202102111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21202102111 its reverse (11120120212), we get a palindrome (32322222323).

The spelling of 21202102111 in words is "twenty-one billion, two hundred two million, one hundred two thousand, one hundred eleven".