21696228089 has 2 divisors, whose sum is σ = 21696228090. Its totient is φ = 21696228088.

The previous prime is 21696228023. The next prime is 21696228101. The reversal of 21696228089 is 98082269612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20290578025 + 1405650064 = 142445^2 + 37492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21696228089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21696228089.

It is not a weakly prime, because it can be changed into another prime (21696228289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848114044 + 10848114045.

It is an arithmetic number, because the mean of its divisors is an integer number (10848114045).

Almost surely, 2^21696228089 is an apocalyptic number.

It is an amenable number.

21696228089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21696228089 is an equidigital number, since it uses as much as digits as its factorization.

21696228089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 21696228089 in words is "twenty-one billion, six hundred ninety-six million, two hundred twenty-eight thousand, eighty-nine".