420421342450091 has 2 divisors, whose sum is σ = 420421342450092. Its totient is φ = 420421342450090.

The previous prime is 420421342450019. The next prime is 420421342450169. The reversal of 420421342450091 is 190054243124024.

It is a happy number.

Together with previous prime (420421342450019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420421342450091 - 2¹⁴ = 420421342433707 is a prime.

It is not a weakly prime, because it can be changed into another prime (420421342450891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210210671225045 + 210210671225046.

It is an arithmetic number, because the mean of its divisors is an integer number (210210671225046).

Almost surely, 2^{420421342450091} is an apocalyptic number.

420421342450091 is a deficient number, since it is larger than the sum of its proper divisors (1).

420421342450091 is an equidigital number, since it uses as much as digits as its factorization.

420421342450091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 420421342450091 in words is "four hundred twenty trillion, four hundred twenty-one billion, three hundred forty-two million, four hundred fifty thousand, ninety-one".