213112013 has 8 divisors (see below), whose sum is σ = 216027000. Its totient is φ = 210208768.

The previous prime is 213111991. The next prime is 213112019. The reversal of 213112013 is 310211312.

It can be written as a sum of positive squares in 4 ways, for example, as 77668969 + 135443044 = 8813^2 + 11638^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213112013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213112019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37295 + ... + 42627.

It is an arithmetic number, because the mean of its divisors is an integer number (27003375).

Almost surely, 2^213112013 is an apocalyptic number.

It is an amenable number.

213112013 is a deficient number, since it is larger than the sum of its proper divisors (2914987).

213112013 is an equidigital number, since it uses as much as digits as its factorization.

213112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5871.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 213112013 is about 14598.3565170878. The cubic root of 213112013 is about 597.3139309625.

Adding to 213112013 its reverse (310211312), we get a palindrome (523323325).

The spelling of 213112013 in words is "two hundred thirteen million, one hundred twelve thousand, thirteen".