215213505 has 32 divisors (see below), whose sum is σ = 373336320. Its totient is φ = 105235200.

The previous prime is 215213503. The next prime is 215213539. The reversal of 215213505 is 505312512.

It is a happy number.

It is not a de Polignac number, because 215213505 - 2¹ = 215213503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215213503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25791 + ... + 33099.

It is an arithmetic number, because the mean of its divisors is an integer number (11666760).

Almost surely, 2^215213505 is an apocalyptic number.

It is an amenable number.

215213505 is a deficient number, since it is larger than the sum of its proper divisors (158122815).

215213505 is a wasteful number, since it uses less digits than its factorization.

215213505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7481.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 215213505 is about 14670.1569521256. The cubic root of 215213505 is about 599.2708782168.

The spelling of 215213505 in words is "two hundred fifteen million, two hundred thirteen thousand, five hundred five".