217212130 has 32 divisors (see below), whose sum is σ = 395850240. Its totient is φ = 85810560.

The previous prime is 217212119. The next prime is 217212139. The reversal of 217212130 is 31212712.

217212130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×217212130² = 94362218838273800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217212098 and 217212107.

It is not an unprimeable number, because it can be changed into a prime (217212139) 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, 453231 + ... + 453709.

It is an arithmetic number, because the mean of its divisors is an integer number (12370320).

Almost surely, 2^217212130 is an apocalyptic number.

217212130 is a deficient number, since it is larger than the sum of its proper divisors (178638110).

217212130 is a wasteful number, since it uses less digits than its factorization.

217212130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 217212130 is about 14738.1182652332. The cubic root of 217212130 is about 601.1202496919.

Adding to 217212130 its reverse (31212712), we get a palindrome (248424842).

The spelling of 217212130 in words is "two hundred seventeen million, two hundred twelve thousand, one hundred thirty".