21441269 has 4 divisors (see below), whose sum is σ = 21454560. Its totient is φ = 21427980.

The previous prime is 21441247. The next prime is 21441271. The reversal of 21441269 is 96214412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21441269 is a prime.

It is a super-2 number, since 2×21441269² = 919456032660722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3827 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (5363640).

Almost surely, 2^21441269 is an apocalyptic number.

It is an amenable number.

21441269 is a deficient number, since it is larger than the sum of its proper divisors (13291).

21441269 is a wasteful number, since it uses less digits than its factorization.

21441269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13290.

The product of its digits is 3456, while the sum is 29.

The square root of 21441269 is about 4630.4717902175. The cubic root of 21441269 is about 277.8114631801.

The spelling of 21441269 in words is "twenty-one million, four hundred forty-one thousand, two hundred sixty-nine".