421686515801 has 2 divisors, whose sum is σ = 421686515802. Its totient is φ = 421686515800.

The previous prime is 421686515791. The next prime is 421686515821. The reversal of 421686515801 is 108515686124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420034906201 + 1651609600 = 648101^2 + 40640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421686515801 is a prime.

It is not a weakly prime, because it can be changed into another prime (421686515821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210843257900 + 210843257901.

It is an arithmetic number, because the mean of its divisors is an integer number (210843257901).

Almost surely, 2^421686515801 is an apocalyptic number.

It is an amenable number.

421686515801 is a deficient number, since it is larger than the sum of its proper divisors (1).

421686515801 is an equidigital number, since it uses as much as digits as its factorization.

421686515801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 421686515801 in words is "four hundred twenty-one billion, six hundred eighty-six million, five hundred fifteen thousand, eight hundred one".