11231313001221 has 32 divisors (see below), whose sum is σ = 15428231331840. Its totient is φ = 7262273519424.

The previous prime is 11231313001211. The next prime is 11231313001241. The reversal of 11231313001221 is 12210031313211.

It is not a de Polignac number, because 11231313001221 - 2¹⁰ = 11231313000197 is a prime.

It is a super-2 number, since 2×11231313001221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231313001211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52262236 + ... + 52476698.

It is an arithmetic number, because the mean of its divisors is an integer number (482132229120).

Almost surely, 2^{11231313001221} is an apocalyptic number.

It is an amenable number.

11231313001221 is a deficient number, since it is larger than the sum of its proper divisors (4196918330619).

11231313001221 is a wasteful number, since it uses less digits than its factorization.

11231313001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215985.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 11231313001221 its reverse (12210031313211), we get a palindrome (23441344314432).

The spelling of 11231313001221 in words is "eleven trillion, two hundred thirty-one billion, three hundred thirteen million, one thousand, two hundred twenty-one".