28028352460021 has 2 divisors, whose sum is σ = 28028352460022. Its totient is φ = 28028352460020.

The previous prime is 28028352460001. The next prime is 28028352460033. The reversal of 28028352460021 is 12006425382082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20853963424996 + 7174389035025 = 4566614^2 + 2678505^2 .

It is a cyclic number.

It is not a de Polignac number, because 28028352460021 - 2¹⁹ = 28028351935733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28028352460021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28028352460001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14014176230010 + 14014176230011.

It is an arithmetic number, because the mean of its divisors is an integer number (14014176230011).

Almost surely, 2^{28028352460021} is an apocalyptic number.

It is an amenable number.

28028352460021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28028352460021 is an equidigital number, since it uses as much as digits as its factorization.

28028352460021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 28028352460021 in words is "twenty-eight trillion, twenty-eight billion, three hundred fifty-two million, four hundred sixty thousand, twenty-one".