21609960611 has 2 divisors, whose sum is σ = 21609960612. Its totient is φ = 21609960610.

The previous prime is 21609960587. The next prime is 21609960649. The reversal of 21609960611 is 11606990612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21609960611 - 2²⁶ = 21542851747 is a prime.

It is not a weakly prime, because it can be changed into another prime (21609962611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10804980305 + 10804980306.

It is an arithmetic number, because the mean of its divisors is an integer number (10804980306).

Almost surely, 2^21609960611 is an apocalyptic number.

21609960611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21609960611 is an equidigital number, since it uses as much as digits as its factorization.

21609960611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 21609960611 in words is "twenty-one billion, six hundred nine million, nine hundred sixty thousand, six hundred eleven".