4431400021 has 2 divisors, whose sum is σ = 4431400022. Its totient is φ = 4431400020.

The previous prime is 4431399991. The next prime is 4431400031. The reversal of 4431400021 is 1200041344.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2791959921 + 1639440100 = 52839^2 + 40490^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431400021 - 2⁹ = 4431399509 is a prime.

It is a super-2 number, since 2×4431400021² = 39274612292237600882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4431400031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2215700010 + 2215700011.

It is an arithmetic number, because the mean of its divisors is an integer number (2215700011).

Almost surely, 2^4431400021 is an apocalyptic number.

It is an amenable number.

4431400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4431400021 is an equidigital number, since it uses as much as digits as its factorization.

4431400021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4431400021 is about 66568.7616003182. The cubic root of 4431400021 is about 1642.5312909239.

Adding to 4431400021 its reverse (1200041344), we get a palindrome (5631441365).

The spelling of 4431400021 in words is "four billion, four hundred thirty-one million, four hundred thousand, twenty-one".