21441140 has 24 divisors (see below), whose sum is σ = 51459072. Its totient is φ = 7351200.

The previous prime is 21441137. The next prime is 21441169. The reversal of 21441140 is 4114412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76436 + ... + 76715.

It is an arithmetic number, because the mean of its divisors is an integer number (2144128).

Almost surely, 2^21441140 is an apocalyptic number.

21441140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21441140 is an abundant number, since it is smaller than the sum of its proper divisors (30017932).

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

21441140 is a wasteful number, since it uses less digits than its factorization.

21441140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153167 (or 153165 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 21441140 is about 4630.4578607304. The cubic root of 21441140 is about 277.8109060341.

Adding to 21441140 its reverse (4114412), we get a palindrome (25555552).

The spelling of 21441140 in words is "twenty-one million, four hundred forty-one thousand, one hundred forty".