21011232311 has 2 divisors, whose sum is σ = 21011232312. Its totient is φ = 21011232310.

The previous prime is 21011232301. The next prime is 21011232353. The reversal of 21011232311 is 11323211012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011232311 - 2⁶ = 21011232247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011232311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011232301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505616155 + 10505616156.

It is an arithmetic number, because the mean of its divisors is an integer number (10505616156).

Almost surely, 2^21011232311 is an apocalyptic number.

21011232311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011232311 is an equidigital number, since it uses as much as digits as its factorization.

21011232311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21011232311 its reverse (11323211012), we get a palindrome (32334443323).

The spelling of 21011232311 in words is "twenty-one billion, eleven million, two hundred thirty-two thousand, three hundred eleven".