21421341 has 40 divisors (see below), whose sum is σ = 34848000. Its totient is φ = 13063680.

The previous prime is 21421333. The next prime is 21421373. The reversal of 21421341 is 14312412.

It is not a de Polignac number, because 21421341 - 2³ = 21421333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421541) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47485 + ... + 47933.

It is an arithmetic number, because the mean of its divisors is an integer number (871200).

Almost surely, 2^21421341 is an apocalyptic number.

It is an amenable number.

21421341 is a deficient number, since it is larger than the sum of its proper divisors (13426659).

21421341 is a wasteful number, since it uses less digits than its factorization.

21421341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 502 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21421341 is about 4628.3194574273. The cubic root of 21421341 is about 277.7253684175.

Adding to 21421341 its reverse (14312412), we get a palindrome (35733753).

The spelling of 21421341 in words is "twenty-one million, four hundred twenty-one thousand, three hundred forty-one".