4068205821 has 12 divisors (see below), whose sum is σ = 5919191772. Its totient is φ = 2692339776.

The previous prime is 4068205807. The next prime is 4068205847. The reversal of 4068205821 is 1285028604.

It can be written as a sum of positive squares in 2 ways, for example, as 2573532900 + 1494672921 = 50730^2 + 38661^2 .

It is not a de Polignac number, because 4068205821 - 2⁵ = 4068205789 is a prime.

It is a super-3 number, since 3×4068205821³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4068205861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1648486 + ... + 1650951.

It is an arithmetic number, because the mean of its divisors is an integer number (493265981).

Almost surely, 2^4068205821 is an apocalyptic number.

It is an amenable number.

4068205821 is a deficient number, since it is larger than the sum of its proper divisors (1850985951).

4068205821 is a wasteful number, since it uses less digits than its factorization.

4068205821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299580 (or 3299577 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 4068205821 is about 63782.4883569150. The cubic root of 4068205821 is about 1596.3727493982.

The spelling of 4068205821 in words is "four billion, sixty-eight million, two hundred five thousand, eight hundred twenty-one".