11331220113231 has 16 divisors (see below), whose sum is σ = 15225211235424. Its totient is φ = 7495735970304.

The previous prime is 11331220113209. The next prime is 11331220113233. The reversal of 11331220113231 is 13231102213311.

It is not a de Polignac number, because 11331220113231 - 2¹⁹ = 11331219588943 is a prime.

It is a super-2 number, since 2×11331220113231² (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 (11331220113233) 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, 5069326 + ... + 6954171.

It is an arithmetic number, because the mean of its divisors is an integer number (951575702214).

Almost surely, 2^{11331220113231} is an apocalyptic number.

11331220113231 is a deficient number, since it is larger than the sum of its proper divisors (3893991122193).

11331220113231 is a wasteful number, since it uses less digits than its factorization.

11331220113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025930.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 11331220113231 its reverse (13231102213311), we get a palindrome (24562322326542).

The spelling of 11331220113231 in words is "eleven trillion, three hundred thirty-one billion, two hundred twenty million, one hundred thirteen thousand, two hundred thirty-one".