420021202 has 4 divisors (see below), whose sum is σ = 630031806. Its totient is φ = 210010600.

The previous prime is 420021157. The next prime is 420021221. The reversal of 420021202 is 202120024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 375545641 + 44475561 = 19379^2 + 6669^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005299 + ... + 105005302.

Almost surely, 2^420021202 is an apocalyptic number.

420021202 is a deficient number, since it is larger than the sum of its proper divisors (210010604).

420021202 is a wasteful number, since it uses less digits than its factorization.

420021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210010603.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 420021202 is about 20494.4188012249. The cubic root of 420021202 is about 748.8998400235.

Adding to 420021202 its reverse (202120024), we get a palindrome (622141226).

The spelling of 420021202 in words is "four hundred twenty million, twenty-one thousand, two hundred two".