11421564 has 96 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 2892480.

The previous prime is 11421559. The next prime is 11421577. The reversal of 11421564 is 46512411.

It is a happy number.

It is a congruent number.

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, 43297 + ... + 43559.

It is an arithmetic number, because the mean of its divisors is an integer number (354816).

Almost surely, 2^11421564 is an apocalyptic number.

11421564 is a gapful number since it is divisible by the number (14) 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 11421564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17031168).

11421564 is an abundant number, since it is smaller than the sum of its proper divisors (22640772).

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

11421564 is a wasteful number, since it uses less digits than its factorization.

11421564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 333 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 11421564 is about 3379.5804473337. The cubic root of 11421564 is about 225.2035294171.

Adding to 11421564 its reverse (46512411), we get a palindrome (57933975).

It can be divided in two parts, 11421 and 564, that multiplied together give a square (6441444 = 2538²).

The spelling of 11421564 in words is "eleven million, four hundred twenty-one thousand, five hundred sixty-four".