11201021231 has 4 divisors (see below), whose sum is σ = 11354459952. Its totient is φ = 11047582512.

The previous prime is 11201021213. The next prime is 11201021269. The reversal of 11201021231 is 13212010211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11201021231 is a prime.

It is a super-2 number, since 2×11201021231² (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 (11201021291) 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, 76719251 + ... + 76719396.

It is an arithmetic number, because the mean of its divisors is an integer number (2838614988).

Almost surely, 2^11201021231 is an apocalyptic number.

11201021231 is a deficient number, since it is larger than the sum of its proper divisors (153438721).

11201021231 is an equidigital number, since it uses as much as digits as its factorization.

11201021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153438720.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 11201021231 its reverse (13212010211), we get a palindrome (24413031442).

The spelling of 11201021231 in words is "eleven billion, two hundred one million, twenty-one thousand, two hundred thirty-one".