20211012191 has 2 divisors, whose sum is σ = 20211012192. Its totient is φ = 20211012190.

The previous prime is 20211012181. The next prime is 20211012259. The reversal of 20211012191 is 19121011202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211012191 is a prime.

It is a super-3 number, since 3×20211012191³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211012181) 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, 10105506095 + 10105506096.

It is an arithmetic number, because the mean of its divisors is an integer number (10105506096).

Almost surely, 2^20211012191 is an apocalyptic number.

20211012191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211012191 is an equidigital number, since it uses as much as digits as its factorization.

20211012191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20211012191 its reverse (19121011202), we get a palindrome (39332023393).

The spelling of 20211012191 in words is "twenty billion, two hundred eleven million, twelve thousand, one hundred ninety-one".