20611219009 has 2 divisors, whose sum is σ = 20611219010. Its totient is φ = 20611219008.

The previous prime is 20611219003. The next prime is 20611219049. The reversal of 20611219009 is 90091211602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13930608784 + 6680610225 = 118028^2 + 81735^2 .

It is a cyclic number.

It is not a de Polignac number, because 20611219009 - 2⁹ = 20611218497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20611219003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10305609504 + 10305609505.

It is an arithmetic number, because the mean of its divisors is an integer number (10305609505).

Almost surely, 2^20611219009 is an apocalyptic number.

It is an amenable number.

20611219009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20611219009 is an equidigital number, since it uses as much as digits as its factorization.

20611219009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 20611219009 in words is "twenty billion, six hundred eleven million, two hundred nineteen thousand, nine".