4155632021 has 2 divisors, whose sum is σ = 4155632022. Its totient is φ = 4155632020.

The previous prime is 4155632017. The next prime is 4155632077. The reversal of 4155632021 is 1202365514.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3125928100 + 1029703921 = 55910^2 + 32089^2 .

It is a cyclic number.

It is not a de Polignac number, because 4155632021 - 2² = 4155632017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4155638021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2077816010 + 2077816011.

It is an arithmetic number, because the mean of its divisors is an integer number (2077816011).

Almost surely, 2^4155632021 is an apocalyptic number.

It is an amenable number.

4155632021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4155632021 is an equidigital number, since it uses as much as digits as its factorization.

4155632021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 4155632021 is about 64464.1917734179. The cubic root of 4155632021 is about 1607.7272074070.

Adding to 4155632021 its reverse (1202365514), we get a palindrome (5357997535).

The spelling of 4155632021 in words is "four billion, one hundred fifty-five million, six hundred thirty-two thousand, twenty-one".