11020021231 has 4 divisors (see below), whose sum is σ = 11668257792. Its totient is φ = 10371784672.

The previous prime is 11020021213. The next prime is 11020021241. The reversal of 11020021231 is 13212002011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13212002011 = 13 ⋅1016307847.

It is a cyclic number.

It is not a de Polignac number, because 11020021231 - 2⁹ = 11020020719 is a prime.

It is a super-2 number, since 2×11020021231² (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 (11020021241) 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, 324118255 + ... + 324118288.

It is an arithmetic number, because the mean of its divisors is an integer number (2917064448).

Almost surely, 2^11020021231 is an apocalyptic number.

11020021231 is a deficient number, since it is larger than the sum of its proper divisors (648236561).

11020021231 is an equidigital number, since it uses as much as digits as its factorization.

11020021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648236560.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 11020021231 its reverse (13212002011), we get a palindrome (24232023242).

The spelling of 11020021231 in words is "eleven billion, twenty million, twenty-one thousand, two hundred thirty-one".