1420202221 has 2 divisors, whose sum is σ = 1420202222. Its totient is φ = 1420202220.

The previous prime is 1420202209. The next prime is 1420202227. The reversal of 1420202221 is 1222020241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1309426596 + 110775625 = 36186^2 + 10525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420202221 - 2¹³ = 1420194029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1420202195 and 1420202204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1420202227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710101110 + 710101111.

It is an arithmetic number, because the mean of its divisors is an integer number (710101111).

Almost surely, 2^1420202221 is an apocalyptic number.

It is an amenable number.

1420202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420202221 is an equidigital number, since it uses as much as digits as its factorization.

1420202221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1420202221 is about 37685.5704613848. The cubic root of 1420202221 is about 1124.0442176114.

Adding to 1420202221 its reverse (1222020241), we get a palindrome (2642222462).

The spelling of 1420202221 in words is "one billion, four hundred twenty million, two hundred two thousand, two hundred twenty-one".