21611457311 has 2 divisors, whose sum is σ = 21611457312. Its totient is φ = 21611457310.

The previous prime is 21611457269. The next prime is 21611457319. The reversal of 21611457311 is 11375411612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21611457311 - 2¹⁸ = 21611195167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21611457319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805728655 + 10805728656.

It is an arithmetic number, because the mean of its divisors is an integer number (10805728656).

Almost surely, 2^21611457311 is an apocalyptic number.

21611457311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611457311 is an equidigital number, since it uses as much as digits as its factorization.

21611457311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

Adding to 21611457311 its reverse (11375411612), we get a palindrome (32986868923).

The spelling of 21611457311 in words is "twenty-one billion, six hundred eleven million, four hundred fifty-seven thousand, three hundred eleven".