4278919021 has 16 divisors (see below), whose sum is σ = 4688889408. Its totient is φ = 3880800000.

The previous prime is 4278918991. The next prime is 4278919061. The reversal of 4278919021 is 1209198724.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4278919021 - 2¹⁹ = 4278394733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278919061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343146 + ... + 355396.

It is an arithmetic number, because the mean of its divisors is an integer number (293055588).

Almost surely, 2^4278919021 is an apocalyptic number.

It is an amenable number.

4278919021 is a deficient number, since it is larger than the sum of its proper divisors (409970387).

4278919021 is a wasteful number, since it uses less digits than its factorization.

4278919021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12732.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 4278919021 is about 65413.4467903962. The cubic root of 4278919021 is about 1623.4715753747.

The spelling of 4278919021 in words is "four billion, two hundred seventy-eight million, nine hundred nineteen thousand, twenty-one".