18700220217 has 16 divisors (see below), whose sum is σ = 28501672320. Its totient is φ = 10683553152.

The previous prime is 18700220213. The next prime is 18700220221. The reversal of 18700220217 is 71202200781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18700220213) and next prime (18700220221).

It is not a de Polignac number, because 18700220217 - 2² = 18700220213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18700220213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7759 + ... + 193547.

It is an arithmetic number, because the mean of its divisors is an integer number (1781354520).

Almost surely, 2^18700220217 is an apocalyptic number.

It is an amenable number.

18700220217 is a deficient number, since it is larger than the sum of its proper divisors (9801452103).

18700220217 is a wasteful number, since it uses less digits than its factorization.

18700220217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190592.

The product of its (nonzero) digits is 3136, while the sum is 30.

Adding to 18700220217 its reverse (71202200781), we get a palindrome (89902420998).

The spelling of 18700220217 in words is "eighteen billion, seven hundred million, two hundred twenty thousand, two hundred seventeen".