420447745221 has 36 divisors (see below), whose sum is σ = 673838074656. Its totient is φ = 232505587440.

The previous prime is 420447745187. The next prime is 420447745279. The reversal of 420447745221 is 122547744024.

It is not a de Polignac number, because 420447745221 - 2¹⁸ = 420447483077 is a prime.

It is a super-2 number, since 2×420447745221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420447745121) 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 in 35 ways as a sum of consecutive naturals, for example, 1346865 + ... + 1629398.

It is an arithmetic number, because the mean of its divisors is an integer number (18717724296).

Almost surely, 2^420447745221 is an apocalyptic number.

It is an amenable number.

420447745221 is a deficient number, since it is larger than the sum of its proper divisors (253390329435).

420447745221 is a wasteful number, since it uses less digits than its factorization.

420447745221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976342 (or 2976304 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 42.

The spelling of 420447745221 in words is "four hundred twenty billion, four hundred forty-seven million, seven hundred forty-five thousand, two hundred twenty-one".