213561005 has 32 divisors (see below), whose sum is σ = 307093248. Its totient is φ = 139507200.

The previous prime is 213560999. The next prime is 213561053. The reversal of 213561005 is 500165312.

It is not a de Polignac number, because 213561005 - 2¹⁴ = 213544621 is a prime.

It is a super-2 number, since 2×213561005² = 91216605713220050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59975 + ... + 63435.

It is an arithmetic number, because the mean of its divisors is an integer number (9596664).

Almost surely, 2^213561005 is an apocalyptic number.

It is an amenable number.

213561005 is a deficient number, since it is larger than the sum of its proper divisors (93532243).

213561005 is a wasteful number, since it uses less digits than its factorization.

213561005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 213561005 is about 14613.7265952255. The cubic root of 213561005 is about 597.7331174885.

The spelling of 213561005 in words is "two hundred thirteen million, five hundred sixty-one thousand, five".