20016362221 has 4 divisors (see below), whose sum is σ = 20143855132. Its totient is φ = 19888869312.

The previous prime is 20016362203. The next prime is 20016362251. The reversal of 20016362221 is 12226361002.

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 12514896900 + 7501465321 = 111870^2 + 86611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20016362221 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 (20016362251) 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 in 3 ways as a sum of consecutive naturals, for example, 63746220 + ... + 63746533.

It is an arithmetic number, because the mean of its divisors is an integer number (5035963783).

Almost surely, 2^20016362221 is an apocalyptic number.

It is an amenable number.

20016362221 is a deficient number, since it is larger than the sum of its proper divisors (127492911).

20016362221 is a wasteful number, since it uses less digits than its factorization.

20016362221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127492910.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 20016362221 in words is "twenty billion, sixteen million, three hundred sixty-two thousand, two hundred twenty-one".