11421540 has 96 divisors (see below), whose sum is σ = 38290560. Its totient is φ = 2809728.

The previous prime is 11421533. The next prime is 11421551. The reversal of 11421540 is 4512411.

11421540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6207 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (398860).

Almost surely, 2^11421540 is an apocalyptic number.

11421540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11421540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19145280).

11421540 is an abundant number, since it is smaller than the sum of its proper divisors (26869020).

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

11421540 is a wasteful number, since it uses less digits than its factorization.

11421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 11421540 is about 3379.5768965952. The cubic root of 11421540 is about 225.2033716778.

Adding to 11421540 its reverse (4512411), we get a palindrome (15933951).

The spelling of 11421540 in words is "eleven million, four hundred twenty-one thousand, five hundred forty".