21235130311 has 2 divisors, whose sum is σ = 21235130312. Its totient is φ = 21235130310.

The previous prime is 21235130251. The next prime is 21235130333. The reversal of 21235130311 is 11303153212.

It is an a-pointer prime, because the next prime (21235130333) can be obtained adding 21235130311 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21235130311 - 2¹³ = 21235122119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21235130011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617565155 + 10617565156.

It is an arithmetic number, because the mean of its divisors is an integer number (10617565156).

Almost surely, 2^21235130311 is an apocalyptic number.

21235130311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21235130311 is an equidigital number, since it uses as much as digits as its factorization.

21235130311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21235130311 its reverse (11303153212), we get a palindrome (32538283523).

The spelling of 21235130311 in words is "twenty-one billion, two hundred thirty-five million, one hundred thirty thousand, three hundred eleven".