21411289 has 4 divisors (see below), whose sum is σ = 21424000. Its totient is φ = 21398580.

The previous prime is 21411287. The next prime is 21411301. The reversal of 21411289 is 98211412.

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 not a de Polignac number, because 21411289 - 2¹ = 21411287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21411281) 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, 3357 + ... + 7354.

It is an arithmetic number, because the mean of its divisors is an integer number (5356000).

Almost surely, 2^21411289 is an apocalyptic number.

It is an amenable number.

21411289 is a deficient number, since it is larger than the sum of its proper divisors (12711).

21411289 is a wasteful number, since it uses less digits than its factorization.

21411289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12710.

The product of its digits is 1152, while the sum is 28.

The square root of 21411289 is about 4627.2334066913. The cubic root of 21411289 is about 277.6819205900.

The spelling of 21411289 in words is "twenty-one million, four hundred eleven thousand, two hundred eighty-nine".