421444991061 has 24 divisors (see below), whose sum is σ = 664526655520. Its totient is φ = 266175780912.

The previous prime is 421444990987. The next prime is 421444991063. The reversal of 421444991061 is 160199444124.

421444991061 is a `hidden beast` number, since 4 + 2 + 144 + 499 + 10 + 6 + 1 = 666.

It is not a de Polignac number, because 421444991061 - 2⁷ = 421444990933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421444990998 and 421444991016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421444991063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45635950 + ... + 45645183.

Almost surely, 2^421444991061 is an apocalyptic number.

It is an amenable number.

421444991061 is a deficient number, since it is larger than the sum of its proper divisors (243081664459).

421444991061 is an equidigital number, since it uses as much as digits as its factorization.

421444991061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91281167 (or 91281155 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 421444991061 in words is "four hundred twenty-one billion, four hundred forty-four million, nine hundred ninety-one thousand, sixty-one".