217020530 has 16 divisors (see below), whose sum is σ = 391461120. Its totient is φ = 86625072.

The previous prime is 217020511. The next prime is 217020533. The reversal of 217020530 is 35020712.

It is not an unprimeable number, because it can be changed into a prime (217020533) 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 7 ways as a sum of consecutive naturals, for example, 17864 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (24466320).

Almost surely, 2^217020530 is an apocalyptic number.

217020530 is a deficient number, since it is larger than the sum of its proper divisors (174440590).

217020530 is a wasteful number, since it uses less digits than its factorization.

217020530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45793.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 217020530 is about 14731.6166797809. The cubic root of 217020530 is about 600.9434509083.

The spelling of 217020530 in words is "two hundred seventeen million, twenty thousand, five hundred thirty".