11210991231 has 32 divisors (see below), whose sum is σ = 16764062976. Its totient is φ = 6604416000.

The previous prime is 11210991229. The next prime is 11210991271. The reversal of 11210991231 is 13219901211.

It is not a de Polignac number, because 11210991231 - 2¹ = 11210991229 is a prime.

It is a super-2 number, since 2×11210991231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11210991271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1425871 + ... + 1433711.

It is an arithmetic number, because the mean of its divisors is an integer number (523876968).

Almost surely, 2^11210991231 is an apocalyptic number.

11210991231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11210991231 is a deficient number, since it is larger than the sum of its proper divisors (5553071745).

11210991231 is a wasteful number, since it uses less digits than its factorization.

11210991231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9063.

The product of its (nonzero) digits is 972, while the sum is 30.

The spelling of 11210991231 in words is "eleven billion, two hundred ten million, nine hundred ninety-one thousand, two hundred thirty-one".