215121195 has 12 divisors (see below), whose sum is σ = 372876816. Its totient is φ = 114731280.

The previous prime is 215121191. The next prime is 215121229. The reversal of 215121195 is 591121512.

It is not a de Polignac number, because 215121195 - 2² = 215121191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215121191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2390191 + ... + 2390280.

It is an arithmetic number, because the mean of its divisors is an integer number (31073068).

Almost surely, 2^215121195 is an apocalyptic number.

215121195 is a deficient number, since it is larger than the sum of its proper divisors (157755621).

215121195 is a wasteful number, since it uses less digits than its factorization.

215121195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780482 (or 4780479 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 215121195 is about 14667.0104315774. The cubic root of 215121195 is about 599.1851856301.

The spelling of 215121195 in words is "two hundred fifteen million, one hundred twenty-one thousand, one hundred ninety-five".