920212101211891 has 2 divisors, whose sum is σ = 920212101211892. Its totient is φ = 920212101211890.

The previous prime is 920212101211889. The next prime is 920212101212011. The reversal of 920212101211891 is 198112101212029.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 920212101211891 - 2¹ = 920212101211889 is a prime.

It is a super-2 number, since 2×920212101211891² (a number of 31 digits) contains 22 as substring.

Together with 920212101211889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (920212101211831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460106050605945 + 460106050605946.

It is an arithmetic number, because the mean of its divisors is an integer number (460106050605946).

Almost surely, 2^{920212101211891} is an apocalyptic number.

920212101211891 is a deficient number, since it is larger than the sum of its proper divisors (1).

920212101211891 is an equidigital number, since it uses as much as digits as its factorization.

920212101211891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 40.

The spelling of 920212101211891 in words is "nine hundred twenty trillion, two hundred twelve billion, one hundred one million, two hundred eleven thousand, eight hundred ninety-one".