1111400021 has 4 divisors (see below), whose sum is σ = 1111713792. Its totient is φ = 1111086252.

The previous prime is 1111400011. The next prime is 1111400029. The reversal of 1111400021 is 1200041111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1111400021 - 2³⁰ = 37658197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111399975 and 1111400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111400029) 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, 151511 + ... + 158676.

It is an arithmetic number, because the mean of its divisors is an integer number (277928448).

Almost surely, 2^1111400021 is an apocalyptic number.

It is an amenable number.

1111400021 is a deficient number, since it is larger than the sum of its proper divisors (313771).

1111400021 is an equidigital number, since it uses as much as digits as its factorization.

1111400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313770.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1111400021 is about 33337.6666999957. Note that the first 4 decimals coincide. The cubic root of 1111400021 is about 1035.8339318915.

Adding to 1111400021 its reverse (1200041111), we get a palindrome (2311441132).

The spelling of 1111400021 in words is "one billion, one hundred eleven million, four hundred thousand, twenty-one".