4241220021 has 10 divisors (see below), whose sum is σ = 6335649782. Its totient is φ = 2827479960.

The previous prime is 4241219971. The next prime is 4241220023. The reversal of 4241220021 is 1200221424.

4241220021 is a `hidden beast` number, since 424 + 1 + 220 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3957668100 + 283551921 = 62910^2 + 16839^2 .

It is not a de Polignac number, because 4241220021 - 2¹³ = 4241211829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4241219976 and 4241220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4241220023) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 26180290 + ... + 26180451.

Almost surely, 2^4241220021 is an apocalyptic number.

It is an amenable number.

4241220021 is a deficient number, since it is larger than the sum of its proper divisors (2094429761).

4241220021 is an equidigital number, since it uses as much as digits as its factorization.

4241220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52360753 (or 52360744 counting only the distinct ones).

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

The square root of 4241220021 is about 65124.6498723794. The cubic root of 4241220021 is about 1618.6896914946.

Adding to 4241220021 its reverse (1200221424), we get a palindrome (5441441445).

The spelling of 4241220021 in words is "four billion, two hundred forty-one million, two hundred twenty thousand, twenty-one".