28221353 has 2 divisors, whose sum is σ = 28221354. Its totient is φ = 28221352.

The previous prime is 28221337. The next prime is 28221367. The reversal of 28221353 is 35312282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22306729 + 5914624 = 4723^2 + 2432^2 .

It is a cyclic number.

It is not a de Polignac number, because 28221353 - 2⁴ = 28221337 is a prime.

It is not a weakly prime, because it can be changed into another prime (28221313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14110676 + 14110677.

It is an arithmetic number, because the mean of its divisors is an integer number (14110677).

Almost surely, 2^28221353 is an apocalyptic number.

It is an amenable number.

28221353 is a deficient number, since it is larger than the sum of its proper divisors (1).

28221353 is an equidigital number, since it uses as much as digits as its factorization.

28221353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 28221353 is about 5312.3773397604. The cubic root of 28221353 is about 304.4569859691.

The spelling of 28221353 in words is "twenty-eight million, two hundred twenty-one thousand, three hundred fifty-three".