420021029 has 2 divisors, whose sum is σ = 420021030. Its totient is φ = 420021028.

The previous prime is 420020987. The next prime is 420021071. The reversal of 420021029 is 920120024.

It is a balanced prime because it is at equal distance from previous prime (420020987) and next prime (420021071).

It can be written as a sum of positive squares in only one way, i.e., 391644100 + 28376929 = 19790^2 + 5327^2 .

It is a cyclic number.

It is not a de Polignac number, because 420021029 - 2⁸ = 420020773 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420021029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420021089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210010514 + 210010515.

It is an arithmetic number, because the mean of its divisors is an integer number (210010515).

Almost surely, 2^420021029 is an apocalyptic number.

It is an amenable number.

420021029 is a deficient number, since it is larger than the sum of its proper divisors (1).

420021029 is an equidigital number, since it uses as much as digits as its factorization.

420021029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 420021029 is about 20494.4145805632. The cubic root of 420021029 is about 748.8997372035.

The spelling of 420021029 in words is "four hundred twenty million, twenty-one thousand, twenty-nine".