213271509 has 16 divisors (see below), whose sum is σ = 310847040. Its totient is φ = 128991360.

The previous prime is 213271493. The next prime is 213271517. The reversal of 213271509 is 905172312.

It is not a de Polignac number, because 213271509 - 2⁴ = 213271493 is a prime.

It is a super-2 number, since 2×213271509² = 90969473102274162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213271549) 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, 10449 + ... + 23145.

It is an arithmetic number, because the mean of its divisors is an integer number (19427940).

Almost surely, 2^213271509 is an apocalyptic number.

It is an amenable number.

213271509 is a deficient number, since it is larger than the sum of its proper divisors (97575531).

213271509 is a wasteful number, since it uses less digits than its factorization.

213271509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 213271509 is about 14603.8183020743. The cubic root of 213271509 is about 597.4629064932.

The spelling of 213271509 in words is "two hundred thirteen million, two hundred seventy-one thousand, five hundred nine".