211123513 has 4 divisors (see below), whose sum is σ = 211926528. Its totient is φ = 210320500.

The previous prime is 211123481. The next prime is 211123543. The reversal of 211123513 is 315321112.

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 211123513 - 2⁵ = 211123481 is a prime.

It is a super-2 number, since 2×211123513² = 89146275482922338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211123543) 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, 401113 + ... + 401638.

It is an arithmetic number, because the mean of its divisors is an integer number (52981632).

Almost surely, 2^211123513 is an apocalyptic number.

It is an amenable number.

211123513 is a deficient number, since it is larger than the sum of its proper divisors (803015).

211123513 is an equidigital number, since it uses as much as digits as its factorization.

211123513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803014.

The product of its digits is 180, while the sum is 19.

The square root of 211123513 is about 14530.0899171340. The cubic root of 211123513 is about 595.4503221791.

Adding to 211123513 its reverse (315321112), we get a palindrome (526444625).

The spelling of 211123513 in words is "two hundred eleven million, one hundred twenty-three thousand, five hundred thirteen".