21341409 has 8 divisors (see below), whose sum is σ = 30129120. Its totient is φ = 13390656.

The previous prime is 21341407. The next prime is 21341479. The reversal of 21341409 is 90414312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21341409 - 2¹ = 21341407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21341407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209179 + ... + 209280.

It is an arithmetic number, because the mean of its divisors is an integer number (3766140).

Almost surely, 2^21341409 is an apocalyptic number.

It is an amenable number.

21341409 is a deficient number, since it is larger than the sum of its proper divisors (8787711).

21341409 is a wasteful number, since it uses less digits than its factorization.

21341409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418479.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21341409 is about 4619.6762873604. The cubic root of 21341409 is about 277.3795012911.

The spelling of 21341409 in words is "twenty-one million, three hundred forty-one thousand, four hundred nine".