211531013 has 8 divisors (see below), whose sum is σ = 217607040. Its totient is φ = 205498720.

The previous prime is 211531007. The next prime is 211531027. The reversal of 211531013 is 310135112.

211531013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 211531013 - 2⁸ = 211530757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211530982 and 211531000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211531063) 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, 995 + ... + 20592.

It is an arithmetic number, because the mean of its divisors is an integer number (27200880).

Almost surely, 2^211531013 is an apocalyptic number.

It is an amenable number.

211531013 is a deficient number, since it is larger than the sum of its proper divisors (6076027).

211531013 is a wasteful number, since it uses less digits than its factorization.

211531013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21867.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 211531013 is about 14544.1057820686. The cubic root of 211531013 is about 595.8331787286.

Adding to 211531013 its reverse (310135112), we get a palindrome (521666125).

The spelling of 211531013 in words is "two hundred eleven million, five hundred thirty-one thousand, thirteen".