4205022421 has 2 divisors, whose sum is σ = 4205022422. Its totient is φ = 4205022420.

The previous prime is 4205022413. The next prime is 4205022439. The reversal of 4205022421 is 1242205024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2778449521 + 1426572900 = 52711^2 + 37770^2 .

It is a cyclic number.

It is not a de Polignac number, because 4205022421 - 2³ = 4205022413 is a prime.

It is a super-2 number, since 2×4205022421² = 35364427122225402482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 4205022392 and 4205022401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4205022401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2102511210 + 2102511211.

It is an arithmetic number, because the mean of its divisors is an integer number (2102511211).

Almost surely, 2^4205022421 is an apocalyptic number.

It is an amenable number.

4205022421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4205022421 is an equidigital number, since it uses as much as digits as its factorization.

4205022421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 4205022421 is about 64846.1442261604. The cubic root of 4205022421 is about 1614.0715103131.

Adding to 4205022421 its reverse (1242205024), we get a palindrome (5447227445).

The spelling of 4205022421 in words is "four billion, two hundred five million, twenty-two thousand, four hundred twenty-one".