11231221001 has 48 divisors (see below), whose sum is σ = 15212131200. Its totient is φ = 8051996160.

The previous prime is 11231220991. The next prime is 11231221013. The reversal of 11231221001 is 10012213211.

It is not a de Polignac number, because 11231221001 - 2¹⁴ = 11231204617 is a prime.

It is a super-2 number, since 2×11231221001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11231221031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4540301 + ... + 4542773.

It is an arithmetic number, because the mean of its divisors is an integer number (316919400).

Almost surely, 2^11231221001 is an apocalyptic number.

11231221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11231221001 is a deficient number, since it is larger than the sum of its proper divisors (3980910199).

11231221001 is a wasteful number, since it uses less digits than its factorization.

11231221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2853 counting only the distinct ones).

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

Adding to 11231221001 its reverse (10012213211), we get a palindrome (21243434212).

It can be divided in two parts, 11231 and 221001, that added together give a palindrome (232232).

The spelling of 11231221001 in words is "eleven billion, two hundred thirty-one million, two hundred twenty-one thousand, one".