11231331021 has 16 divisors (see below), whose sum is σ = 16655838720. Its totient is φ = 7479980640.

The previous prime is 11231330987. The next prime is 11231331029. The reversal of 11231331021 is 12013313211.

It is not a de Polignac number, because 11231331021 - 2⁷ = 11231330893 is a prime.

It is a super-2 number, since 2×11231331021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11231330985 and 11231331003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231331029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183120 + ... + 236633.

It is an arithmetic number, because the mean of its divisors is an integer number (1040989920).

Almost surely, 2^11231331021 is an apocalyptic number.

It is an amenable number.

11231331021 is a deficient number, since it is larger than the sum of its proper divisors (5424507699).

11231331021 is an equidigital number, since it uses as much as digits as its factorization.

11231331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420753 (or 420747 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 11231331021 its reverse (12013313211), we get a palindrome (23244644232).

The spelling of 11231331021 in words is "eleven billion, two hundred thirty-one million, three hundred thirty-one thousand, twenty-one".