21831722911 has 2 divisors, whose sum is σ = 21831722912. Its totient is φ = 21831722910.

The previous prime is 21831722879. The next prime is 21831722923. The reversal of 21831722911 is 11922713812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21831722911 - 2⁵ = 21831722879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21831722971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915861455 + 10915861456.

It is an arithmetic number, because the mean of its divisors is an integer number (10915861456).

Almost surely, 2^21831722911 is an apocalyptic number.

21831722911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21831722911 is an equidigital number, since it uses as much as digits as its factorization.

21831722911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

Subtracting from 21831722911 its reverse (11922713812), we obtain a palindrome (9909009099).

The spelling of 21831722911 in words is "twenty-one billion, eight hundred thirty-one million, seven hundred twenty-two thousand, nine hundred eleven".