4180220021 has 2 divisors, whose sum is σ = 4180220022. Its totient is φ = 4180220020.

The previous prime is 4180219991. The next prime is 4180220029. The reversal of 4180220021 is 1200220814.

It is a happy number.

4180220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4017784996 + 162435025 = 63386^2 + 12745^2 .

It is a cyclic number.

It is not a de Polignac number, because 4180220021 - 2⁶ = 4180219957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4180219975 and 4180220002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4180220029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2090110010 + 2090110011.

It is an arithmetic number, because the mean of its divisors is an integer number (2090110011).

Almost surely, 2^4180220021 is an apocalyptic number.

It is an amenable number.

4180220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4180220021 is an equidigital number, since it uses as much as digits as its factorization.

4180220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 4180220021 is about 64654.6210336121. The cubic root of 4180220021 is about 1610.8918352755.

Adding to 4180220021 its reverse (1200220814), we get a palindrome (5380440835).

The spelling of 4180220021 in words is "four billion, one hundred eighty million, two hundred twenty thousand, twenty-one".