4000880021 has 2 divisors, whose sum is σ = 4000880022. Its totient is φ = 4000880020.

The previous prime is 4000879997. The next prime is 4000880053. The reversal of 4000880021 is 1200880004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3938943121 + 61936900 = 62761^2 + 7870^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000880021 - 2¹⁰ = 4000878997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000883021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000440010 + 2000440011.

It is an arithmetic number, because the mean of its divisors is an integer number (2000440011).

Almost surely, 2^4000880021 is an apocalyptic number.

It is an amenable number.

4000880021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000880021 is an equidigital number, since it uses as much as digits as its factorization.

4000880021 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 23.

The square root of 4000880021 is about 63252.5099976278. The cubic root of 4000880021 is about 1587.5174556206.

The spelling of 4000880021 in words is "four billion, eight hundred eighty thousand, twenty-one".