21300211111 has 2 divisors, whose sum is σ = 21300211112. Its totient is φ = 21300211110.

The previous prime is 21300211099. The next prime is 21300211157. The reversal of 21300211111 is 11111200312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21300211111 - 2²¹ = 21298113959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21300211091 and 21300211100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300211811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650105555 + 10650105556.

It is an arithmetic number, because the mean of its divisors is an integer number (10650105556).

Almost surely, 2^21300211111 is an apocalyptic number.

21300211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300211111 is an equidigital number, since it uses as much as digits as its factorization.

21300211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21300211111 its reverse (11111200312), we get a palindrome (32411411423).

The spelling of 21300211111 in words is "twenty-one billion, three hundred million, two hundred eleven thousand, one hundred eleven".