11421111555 has 24 divisors (see below), whose sum is σ = 22624678752. Its totient is φ = 5221079424.

The previous prime is 11421111539. The next prime is 11421111589. The reversal of 11421111555 is 55511112411.

It is not a de Polignac number, because 11421111555 - 2⁴ = 11421111539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18128434 + ... + 18129063.

It is an arithmetic number, because the mean of its divisors is an integer number (942694948).

Almost surely, 2^11421111555 is an apocalyptic number.

11421111555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11421111555 is a deficient number, since it is larger than the sum of its proper divisors (11203567197).

11421111555 is a wasteful number, since it uses less digits than its factorization.

11421111555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36257515 (or 36257512 counting only the distinct ones).

The product of its digits is 1000, while the sum is 27.

Adding to 11421111555 its reverse (55511112411), we get a palindrome (66932223966).

The spelling of 11421111555 in words is "eleven billion, four hundred twenty-one million, one hundred eleven thousand, five hundred fifty-five".