20163221594 has 8 divisors (see below), whose sum is σ = 30245731860. Its totient is φ = 10081310976.

The previous prime is 20163221581. The next prime is 20163221609. The reversal of 20163221594 is 49512236102.

It can be written as a sum of positive squares in 2 ways, for example, as 18789555625 + 1373665969 = 137075^2 + 37063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53429 + ... + 207800.

Almost surely, 2^20163221594 is an apocalyptic number.

20163221594 is a deficient number, since it is larger than the sum of its proper divisors (10082510266).

20163221594 is a wasteful number, since it uses less digits than its factorization.

20163221594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299824.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 20163221594 its reverse (49512236102), we get a palindrome (69675457696).

The spelling of 20163221594 in words is "twenty billion, one hundred sixty-three million, two hundred twenty-one thousand, five hundred ninety-four".