11111421 has 16 divisors (see below), whose sum is σ = 15773184. Its totient is φ = 6933504.

The previous prime is 11111417. The next prime is 11111431. The reversal of 11111421 is 12411111.

It is not a de Polignac number, because 11111421 - 2² = 11111417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111397 and 11111406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111431) 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, 10885 + ... + 11861.

It is an arithmetic number, because the mean of its divisors is an integer number (985824).

Almost surely, 2^11111421 is an apocalyptic number.

It is an amenable number.

11111421 is a deficient number, since it is larger than the sum of its proper divisors (4661763).

11111421 is a wasteful number, since it uses less digits than its factorization.

11111421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its digits is 8, while the sum is 12.

The square root of 11111421 is about 3333.3798163426. The cubic root of 11111421 is about 223.1463911731.

Adding to 11111421 its reverse (12411111), we get a palindrome (23522532).

The spelling of 11111421 in words is "eleven million, one hundred eleven thousand, four hundred twenty-one".