420446634221 has 4 divisors (see below), whose sum is σ = 420447945372. Its totient is φ = 420445323072.

The previous prime is 420446634197. The next prime is 420446634259. The reversal of 420446634221 is 122436644024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 75631050121 + 344815584100 = 275011^2 + 587210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420446634221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420446630221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182885 + ... + 935061.

It is an arithmetic number, because the mean of its divisors is an integer number (105111986343).

Almost surely, 2^420446634221 is an apocalyptic number.

It is an amenable number.

420446634221 is a deficient number, since it is larger than the sum of its proper divisors (1311151).

420446634221 is an equidigital number, since it uses as much as digits as its factorization.

420446634221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311150.

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 420446634221 in words is "four hundred twenty billion, four hundred forty-six million, six hundred thirty-four thousand, two hundred twenty-one".