21879338311 has 2 divisors, whose sum is σ = 21879338312. Its totient is φ = 21879338310.

The previous prime is 21879338309. The next prime is 21879338323. The reversal of 21879338311 is 11383397812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21879338311 - 2¹ = 21879338309 is a prime.

Together with 21879338309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21879338381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10939669155 + 10939669156.

It is an arithmetic number, because the mean of its divisors is an integer number (10939669156).

Almost surely, 2^21879338311 is an apocalyptic number.

21879338311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21879338311 is an equidigital number, since it uses as much as digits as its factorization.

21879338311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The spelling of 21879338311 in words is "twenty-one billion, eight hundred seventy-nine million, three hundred thirty-eight thousand, three hundred eleven".