11111231020 has 12 divisors (see below), whose sum is σ = 23333585184. Its totient is φ = 4444492400.

The previous prime is 11111231011. The next prime is 11111231029. The reversal of 11111231020 is 2013211111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11111231011) and next prime (11111231029).

It is not an unprimeable number, because it can be changed into a prime (11111231029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277780756 + ... + 277780795.

It is an arithmetic number, because the mean of its divisors is an integer number (1944465432).

Almost surely, 2^11111231020 is an apocalyptic number.

11111231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111231020 is an abundant number, since it is smaller than the sum of its proper divisors (12222354164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111231020 is a wasteful number, since it uses less digits than its factorization.

11111231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555561560 (or 555561558 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11111231020 its reverse (2013211111), we get a palindrome (13124442131).

The spelling of 11111231020 in words is "eleven billion, one hundred eleven million, two hundred thirty-one thousand, twenty".