21320213311 has 2 divisors, whose sum is σ = 21320213312. Its totient is φ = 21320213310.

The previous prime is 21320213279. The next prime is 21320213333. The reversal of 21320213311 is 11331202312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320213311 - 2⁵ = 21320213279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320213611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660106655 + 10660106656.

It is an arithmetic number, because the mean of its divisors is an integer number (10660106656).

Almost surely, 2^21320213311 is an apocalyptic number.

21320213311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320213311 is an equidigital number, since it uses as much as digits as its factorization.

21320213311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21320213311 its reverse (11331202312), we get a palindrome (32651415623).

The spelling of 21320213311 in words is "twenty-one billion, three hundred twenty million, two hundred thirteen thousand, three hundred eleven".