20210021021191 has 2 divisors, whose sum is σ = 20210021021192. Its totient is φ = 20210021021190.

The previous prime is 20210021021161. The next prime is 20210021021249. The reversal of 20210021021191 is 19112012001202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210021021191 is a prime.

It is a super-2 number, since 2×20210021021191² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210021021111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105010510595 + 10105010510596.

It is an arithmetic number, because the mean of its divisors is an integer number (10105010510596).

Almost surely, 2^{20210021021191} is an apocalyptic number.

20210021021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210021021191 is an equidigital number, since it uses as much as digits as its factorization.

20210021021191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 20210021021191 its reverse (19112012001202), we get a palindrome (39322033022393).

The spelling of 20210021021191 in words is "twenty trillion, two hundred ten billion, twenty-one million, twenty-one thousand, one hundred ninety-one".