4021022821 has 2 divisors, whose sum is σ = 4021022822. Its totient is φ = 4021022820.

The previous prime is 4021022777. The next prime is 4021022857. The reversal of 4021022821 is 1282201204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2198672100 + 1822350721 = 46890^2 + 42689^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021022821 - 2⁹ = 4021022309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021022792 and 4021022801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021022881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010511410 + 2010511411.

It is an arithmetic number, because the mean of its divisors is an integer number (2010511411).

Almost surely, 2^4021022821 is an apocalyptic number.

It is an amenable number.

4021022821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021022821 is an equidigital number, since it uses as much as digits as its factorization.

4021022821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 4021022821 is about 63411.5353938067. The cubic root of 4021022821 is about 1590.1771648374.

The spelling of 4021022821 in words is "four billion, twenty-one million, twenty-two thousand, eight hundred twenty-one".