11421018 has 72 divisors (see below), whose sum is σ = 30090528. Its totient is φ = 3115728.

The previous prime is 11421017. The next prime is 11421019. The reversal of 11421018 is 81012411.

11421018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11421017) and next prime (11421019).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (11421017) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20005 + ... + 20567.

It is an arithmetic number, because the mean of its divisors is an integer number (417924).

Almost surely, 2^11421018 is an apocalyptic number.

11421018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11421018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15045264).

11421018 is an abundant number, since it is smaller than the sum of its proper divisors (18669510).

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

11421018 is a wasteful number, since it uses less digits than its factorization.

11421018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 11421018 is about 3379.4996671105. The cubic root of 11421018 is about 225.1999407934.

11421018 divided by its sum of digits (18) gives a triangular number (634501 = T₁₁₂₆).

Adding to 11421018 its reverse (81012411), we get a palindrome (92433429).

The spelling of 11421018 in words is "eleven million, four hundred twenty-one thousand, eighteen".