21770351593 has 2 divisors, whose sum is σ = 21770351594. Its totient is φ = 21770351592.

The previous prime is 21770351573. The next prime is 21770351633. The reversal of 21770351593 is 39515307712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16902080064 + 4868271529 = 130008^2 + 69773^2 .

It is a cyclic number.

It is not a de Polignac number, because 21770351593 - 2⁹ = 21770351081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21770351573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10885175796 + 10885175797.

It is an arithmetic number, because the mean of its divisors is an integer number (10885175797).

Almost surely, 2^21770351593 is an apocalyptic number.

It is an amenable number.

21770351593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21770351593 is an equidigital number, since it uses as much as digits as its factorization.

21770351593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450, while the sum is 43.

The spelling of 21770351593 in words is "twenty-one billion, seven hundred seventy million, three hundred fifty-one thousand, five hundred ninety-three".