11021031231 has 8 divisors (see below), whose sum is σ = 16793952384. Its totient is φ = 6297732120.

The previous prime is 11021031227. The next prime is 11021031257. The reversal of 11021031231 is 13213012011.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11021031231 - 2² = 11021031227 is a prime.

It is a super-2 number, since 2×11021031231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11021031231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021031431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262405485 + ... + 262405526.

It is an arithmetic number, because the mean of its divisors is an integer number (2099244048).

Almost surely, 2^11021031231 is an apocalyptic number.

11021031231 is a deficient number, since it is larger than the sum of its proper divisors (5772921153).

11021031231 is an equidigital number, since it uses as much as digits as its factorization.

11021031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524811021.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11021031231 its reverse (13213012011), we get a palindrome (24234043242).

The spelling of 11021031231 in words is "eleven billion, twenty-one million, thirty-one thousand, two hundred thirty-one".