20211157789 has 2 divisors, whose sum is σ = 20211157790. Its totient is φ = 20211157788.

The previous prime is 20211157787. The next prime is 20211157817. The reversal of 20211157789 is 98775111202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12844368889 + 7366788900 = 113333^2 + 85830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211157789 - 2¹ = 20211157787 is a prime.

Together with 20211157787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211157781) 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, 10105578894 + 10105578895.

It is an arithmetic number, because the mean of its divisors is an integer number (10105578895).

Almost surely, 2^20211157789 is an apocalyptic number.

It is an amenable number.

20211157789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211157789 is an equidigital number, since it uses as much as digits as its factorization.

20211157789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 43.

The spelling of 20211157789 in words is "twenty billion, two hundred eleven million, one hundred fifty-seven thousand, seven hundred eighty-nine".