28089519221 has 2 divisors, whose sum is σ = 28089519222. Its totient is φ = 28089519220.

The previous prime is 28089519217. The next prime is 28089519223. The reversal of 28089519221 is 12291598082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23233380625 + 4856138596 = 152425^2 + 69686^2 .

It is a cyclic number.

It is not a de Polignac number, because 28089519221 - 2² = 28089519217 is a prime.

Together with 28089519223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28089519223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14044759610 + 14044759611.

It is an arithmetic number, because the mean of its divisors is an integer number (14044759611).

Almost surely, 2^28089519221 is an apocalyptic number.

It is an amenable number.

28089519221 is a deficient number, since it is larger than the sum of its proper divisors (1).

28089519221 is an equidigital number, since it uses as much as digits as its factorization.

28089519221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 28089519221 in words is "twenty-eight billion, eighty-nine million, five hundred nineteen thousand, two hundred twenty-one".