11211023231 has 4 divisors (see below), whose sum is σ = 11484462864. Its totient is φ = 10937583600.

The previous prime is 11211023191. The next prime is 11211023267. The reversal of 11211023231 is 13232011211.

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 11211023231 - 2¹⁸ = 11210761087 is a prime.

It is a super-2 number, since 2×11211023231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211083231) 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, 136719755 + ... + 136719836.

It is an arithmetic number, because the mean of its divisors is an integer number (2871115716).

Almost surely, 2^11211023231 is an apocalyptic number.

11211023231 is a deficient number, since it is larger than the sum of its proper divisors (273439633).

11211023231 is an equidigital number, since it uses as much as digits as its factorization.

11211023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273439632.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11211023231 its reverse (13232011211), we get a palindrome (24443034442).

The spelling of 11211023231 in words is "eleven billion, two hundred eleven million, twenty-three thousand, two hundred thirty-one".