215211530 has 32 divisors (see below), whose sum is σ = 393652224. Its totient is φ = 84700096.

The previous prime is 215211509. The next prime is 215211539. The reversal of 215211530 is 35112512.

It is a happy number.

It is a super-3 number, since 3×215211530³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (215211539) 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, 317552 + ... + 318228.

It is an arithmetic number, because the mean of its divisors is an integer number (12301632).

Almost surely, 2^215211530 is an apocalyptic number.

215211530 is a deficient number, since it is larger than the sum of its proper divisors (178440694).

215211530 is a wasteful number, since it uses less digits than its factorization.

215211530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 215211530 is about 14670.0896384446. The cubic root of 215211530 is about 599.2690450549.

The spelling of 215211530 in words is "two hundred fifteen million, two hundred eleven thousand, five hundred thirty".