215671071 has 32 divisors (see below), whose sum is σ = 377395200. Its totient is φ = 106138080.

The previous prime is 215671067. The next prime is 215671073. The reversal of 215671071 is 170176512.

It is not a de Polignac number, because 215671071 - 2² = 215671067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215671073) 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, 20181 + ... + 28958.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^215671071 is an apocalyptic number.

215671071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

215671071 is a deficient number, since it is larger than the sum of its proper divisors (161724129).

215671071 is a wasteful number, since it uses less digits than its factorization.

215671071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49179.

The product of its (nonzero) digits is 2940, while the sum is 30.

The square root of 215671071 is about 14685.7438013878. The cubic root of 215671071 is about 599.6952813816.

The spelling of 215671071 in words is "two hundred fifteen million, six hundred seventy-one thousand, seventy-one".