4279226821 has 4 divisors (see below), whose sum is σ = 4280249644. Its totient is φ = 4278204000.

The previous prime is 4279226803. The next prime is 4279226827. The reversal of 4279226821 is 1286229724.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1094881921 + 3184344900 = 33089^2 + 56430^2 .

It is a cyclic number.

It is not a de Polignac number, because 4279226821 - 2⁵ = 4279226789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4279226827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505110 + ... + 513511.

It is an arithmetic number, because the mean of its divisors is an integer number (1070062411).

Almost surely, 2^4279226821 is an apocalyptic number.

It is an amenable number.

4279226821 is a deficient number, since it is larger than the sum of its proper divisors (1022823).

4279226821 is a wasteful number, since it uses less digits than its factorization.

4279226821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022822.

The product of its digits is 193536, while the sum is 43.

The square root of 4279226821 is about 65415.7994753561. The cubic root of 4279226821 is about 1623.5105020730.

The spelling of 4279226821 in words is "four billion, two hundred seventy-nine million, two hundred twenty-six thousand, eight hundred twenty-one".