421220241 has 12 divisors (see below), whose sum is σ = 655231668. Its totient is φ = 259212384.

The previous prime is 421220231. The next prime is 421220249. The reversal of 421220241 is 142022124.

421220241 is a `hidden beast` number, since 421 + 2 + 2 + 0 + 241 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 47610000 + 373610241 = 6900^2 + 19329^2 .

It is not a de Polignac number, because 421220241 - 2⁷ = 421220113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421220249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1799970 + ... + 1800203.

It is an arithmetic number, because the mean of its divisors is an integer number (54602639).

Almost surely, 2^421220241 is an apocalyptic number.

It is an amenable number.

421220241 is a deficient number, since it is larger than the sum of its proper divisors (234011427).

421220241 is a wasteful number, since it uses less digits than its factorization.

421220241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600192 (or 3600189 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 421220241 is about 20523.6507717316. The cubic root of 421220241 is about 749.6117937626.

Adding to 421220241 its reverse (142022124), we get a palindrome (563242365).

The spelling of 421220241 in words is "four hundred twenty-one million, two hundred twenty thousand, two hundred forty-one".