20016233307221 has 4 divisors (see below), whose sum is σ = 20222586228012. Its totient is φ = 19809880386432.

The previous prime is 20016233307209. The next prime is 20016233307263. The reversal of 20016233307221 is 12270333261002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3213522316900 + 16802710990321 = 1792630^2 + 4099111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20016233307221 - 2¹⁸ = 20016233045077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20016233300221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103176460250 + ... + 103176460443.

It is an arithmetic number, because the mean of its divisors is an integer number (5055646557003).

Almost surely, 2^{20016233307221} is an apocalyptic number.

It is an amenable number.

20016233307221 is a deficient number, since it is larger than the sum of its proper divisors (206352920791).

20016233307221 is an equidigital number, since it uses as much as digits as its factorization.

20016233307221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206352920790.

The product of its (nonzero) digits is 18144, while the sum is 32.

Adding to 20016233307221 its reverse (12270333261002), we get a palindrome (32286566568223).

The spelling of 20016233307221 in words is "twenty trillion, sixteen billion, two hundred thirty-three million, three hundred seven thousand, two hundred twenty-one".