421050191 has 2 divisors, whose sum is σ = 421050192. Its totient is φ = 421050190.

The previous prime is 421050181. The next prime is 421050209. The reversal of 421050191 is 191050124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421050191 is a prime.

It is a super-2 number, since 2×421050191² = 354566526682272962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421050181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210525095 + 210525096.

It is an arithmetic number, because the mean of its divisors is an integer number (210525096).

Almost surely, 2^421050191 is an apocalyptic number.

421050191 is a deficient number, since it is larger than the sum of its proper divisors (1).

421050191 is an equidigital number, since it uses as much as digits as its factorization.

421050191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 421050191 is about 20519.5075720642. The cubic root of 421050191 is about 749.5109054143.

The spelling of 421050191 in words is "four hundred twenty-one million, fifty thousand, one hundred ninety-one".