21141144 has 48 divisors (see below), whose sum is σ = 57470400. Its totient is φ = 7020864.

The previous prime is 21141143. The next prime is 21141161. The reversal of 21141144 is 44114112.

21141144 is a `hidden beast` number, since 211 + 411 + 44 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34182 + ... + 34794.

It is an arithmetic number, because the mean of its divisors is an integer number (1197300).

Almost surely, 2^21141144 is an apocalyptic number.

21141144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21141144 is an abundant number, since it is smaller than the sum of its proper divisors (36329256).

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

21141144 is a wasteful number, since it uses less digits than its factorization.

21141144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104 (or 1097 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 21141144 is about 4597.9499779793. The cubic root of 21141144 is about 276.5091421145.

Adding to 21141144 its reverse (44114112), we get a palindrome (65255256).

The spelling of 21141144 in words is "twenty-one million, one hundred forty-one thousand, one hundred forty-four".