420021669 has 16 divisors (see below), whose sum is σ = 609000768. Its totient is φ = 256419072.

The previous prime is 420021631. The next prime is 420021673. The reversal of 420021669 is 966120024.

It is not a de Polignac number, because 420021669 - 2⁹ = 420021157 is a prime.

It is a super-2 number, since 2×420021669² = 352836404859091122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420021689) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 109407 + ... + 113180.

It is an arithmetic number, because the mean of its divisors is an integer number (38062548).

Almost surely, 2^420021669 is an apocalyptic number.

It is an amenable number.

420021669 is a deficient number, since it is larger than the sum of its proper divisors (188979099).

420021669 is a wasteful number, since it uses less digits than its factorization.

420021669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222644.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 420021669 is about 20494.4301945675. The cubic root of 420021669 is about 748.9001175778.

The spelling of 420021669 in words is "four hundred twenty million, twenty-one thousand, six hundred sixty-nine".