217215130 has 32 divisors (see below), whose sum is σ = 436943808. Its totient is φ = 77059200.

The previous prime is 217215127. The next prime is 217215143. The reversal of 217215130 is 31512712.

It is a happy number.

217215130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19572 + ... + 28591.

It is an arithmetic number, because the mean of its divisors is an integer number (13654494).

Almost surely, 2^217215130 is an apocalyptic number.

217215130 is an abundant number, since it is smaller than the sum of its proper divisors (219728678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217215130 is a wasteful number, since it uses less digits than its factorization.

217215130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48222.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 217215130 is about 14738.2200417825. The cubic root of 217215130 is about 601.1230171132.

Adding to 217215130 its reverse (31512712), we get a palindrome (248727842).

The spelling of 217215130 in words is "two hundred seventeen million, two hundred fifteen thousand, one hundred thirty".