21888673811 has 2 divisors, whose sum is σ = 21888673812. Its totient is φ = 21888673810.

The previous prime is 21888673753. The next prime is 21888673837. The reversal of 21888673811 is 11837688812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21888673811 is a prime.

It is a super-2 number, since 2×21888673811² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21888673841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944336905 + 10944336906.

It is an arithmetic number, because the mean of its divisors is an integer number (10944336906).

Almost surely, 2^21888673811 is an apocalyptic number.

21888673811 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888673811 is an equidigital number, since it uses as much as digits as its factorization.

21888673811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 53.

The spelling of 21888673811 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred eleven".