947806421999 has 2 divisors, whose sum is σ = 947806422000. Its totient is φ = 947806421998.

The previous prime is 947806421983. The next prime is 947806422049. The reversal of 947806421999 is 999124608749.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 947806421999 - 2⁴ = 947806421983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947806421699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473903210999 + 473903211000.

It is an arithmetic number, because the mean of its divisors is an integer number (473903211000).

Almost surely, 2^947806421999 is an apocalyptic number.

947806421999 is a deficient number, since it is larger than the sum of its proper divisors (1).

947806421999 is an equidigital number, since it uses as much as digits as its factorization.

947806421999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70543872, while the sum is 68.

The spelling of 947806421999 in words is "nine hundred forty-seven billion, eight hundred six million, four hundred twenty-one thousand, nine hundred ninety-nine".