211513 has 4 divisors (see below), whose sum is σ = 218368. Its totient is φ = 204660.

The previous prime is 211507. The next prime is 211543. The reversal of 211513 is 315112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211513 - 2¹³ = 203321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211493 and 211502.

It is not an unprimeable number, because it can be changed into a prime (211543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3381 + ... + 3442.

It is an arithmetic number, because the mean of its divisors is an integer number (54592).

2²¹¹⁵¹³ is an apocalyptic number.

It is an amenable number.

211513 is a deficient number, since it is larger than the sum of its proper divisors (6855).

211513 is an equidigital number, since it uses as much as digits as its factorization.

211513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854.

The product of its digits is 30, while the sum is 13.

The square root of 211513 is about 459.9054250604. The cubic root of 211513 is about 59.5816265452.

Adding to 211513 its reverse (315112), we get a palindrome (526625).

It can be divided in two parts, 2115 and 13, that multiplied together give a triangular number (27495 = T₂₃₄).

The spelling of 211513 in words is "two hundred eleven thousand, five hundred thirteen".