213111011 has 4 divisors (see below), whose sum is σ = 224327400. Its totient is φ = 201894624.

The previous prime is 213111007. The next prime is 213111013. The reversal of 213111011 is 110111312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213111011 - 2² = 213111007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213110983 and 213111001.

It is not an unprimeable number, because it can be changed into a prime (213111013) 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, 5608166 + ... + 5608203.

It is an arithmetic number, because the mean of its divisors is an integer number (56081850).

Almost surely, 2^213111011 is an apocalyptic number.

213111011 is a deficient number, since it is larger than the sum of its proper divisors (11216389).

213111011 is a wasteful number, since it uses less digits than its factorization.

213111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11216388.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 213111011 is about 14598.3221981158. The cubic root of 213111011 is about 597.3129948202.

Adding to 213111011 its reverse (110111312), we get a palindrome (323222323).

It can be divided in two parts, 21311 and 1011, that added together give a palindrome (22322).

The spelling of 213111011 in words is "two hundred thirteen million, one hundred eleven thousand, eleven".