21541338 has 48 divisors (see below), whose sum is σ = 57447936. Its totient is φ = 5680800.

The previous prime is 21541337. The next prime is 21541339. The reversal of 21541338 is 83314512.

It is a happy number.

21541338 is a `hidden beast` number, since 215 + 413 + 38 = 666.

It is an interprime number because it is at equal distance from previous prime (21541337) and next prime (21541339).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4938 + ... + 8213.

It is an arithmetic number, because the mean of its divisors is an integer number (1196832).

Almost surely, 2^21541338 is an apocalyptic number.

21541338 is an abundant number, since it is smaller than the sum of its proper divisors (35906598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21541338 is a wasteful number, since it uses less digits than its factorization.

21541338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13179 (or 13176 counting only the distinct ones).

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

The square root of 21541338 is about 4641.2646983338. The cubic root of 21541338 is about 278.2429858036.

The spelling of 21541338 in words is "twenty-one million, five hundred forty-one thousand, three hundred thirty-eight".