21538341 has 12 divisors (see below), whose sum is σ = 33939360. Its totient is φ = 13053480.

The previous prime is 21538339. The next prime is 21538379. The reversal of 21538341 is 14383512.

It is a happy number.

It is not a de Polignac number, because 21538341 - 2¹ = 21538339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21538301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108681 + ... + 108878.

It is an arithmetic number, because the mean of its divisors is an integer number (2828280).

Almost surely, 2^21538341 is an apocalyptic number.

It is an amenable number.

21538341 is a deficient number, since it is larger than the sum of its proper divisors (12401019).

21538341 is a wasteful number, since it uses less digits than its factorization.

21538341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217576 (or 217573 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21538341 is about 4640.9418225184. The cubic root of 21538341 is about 278.2300814225.

The spelling of 21538341 in words is "twenty-one million, five hundred thirty-eight thousand, three hundred forty-one".