21300001211 has 2 divisors, whose sum is σ = 21300001212. Its totient is φ = 21300001210.

The previous prime is 21300001187. The next prime is 21300001231. The reversal of 21300001211 is 11210000312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300001211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21300001192 and 21300001201.

It is not a weakly prime, because it can be changed into another prime (21300001231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650000605 + 10650000606.

It is an arithmetic number, because the mean of its divisors is an integer number (10650000606).

Almost surely, 2^21300001211 is an apocalyptic number.

21300001211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300001211 is an equidigital number, since it uses as much as digits as its factorization.

21300001211 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 11.

Adding to 21300001211 its reverse (11210000312), we get a palindrome (32510001523).

The spelling of 21300001211 in words is "twenty-one billion, three hundred million, one thousand, two hundred eleven".