21010322191 has 2 divisors, whose sum is σ = 21010322192. Its totient is φ = 21010322190.

The previous prime is 21010322161. The next prime is 21010322231. The reversal of 21010322191 is 19122301012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010322191 - 2⁵ = 21010322159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010322111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505161095 + 10505161096.

It is an arithmetic number, because the mean of its divisors is an integer number (10505161096).

Almost surely, 2^21010322191 is an apocalyptic number.

21010322191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010322191 is an equidigital number, since it uses as much as digits as its factorization.

21010322191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21010322191 in words is "twenty-one billion, ten million, three hundred twenty-two thousand, one hundred ninety-one".