20211565079 has 2 divisors, whose sum is σ = 20211565080. Its totient is φ = 20211565078.

The previous prime is 20211565057. The next prime is 20211565133. The reversal of 20211565079 is 97056511202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211565079 - 2¹⁶ = 20211499543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211565019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105782539 + 10105782540.

It is an arithmetic number, because the mean of its divisors is an integer number (10105782540).

Almost surely, 2^20211565079 is an apocalyptic number.

20211565079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211565079 is an equidigital number, since it uses as much as digits as its factorization.

20211565079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 20211565079 in words is "twenty billion, two hundred eleven million, five hundred sixty-five thousand, seventy-nine".