21841398 has 24 divisors (see below), whose sum is σ = 49381488. Its totient is φ = 6963792.

The previous prime is 21841373. The next prime is 21841399. The reversal of 21841398 is 89314812.

It is a hoax number, since the sum of its digits (36) 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 (21841399) 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, 25965 + ... + 26792.

It is an arithmetic number, because the mean of its divisors is an integer number (2057562).

Almost surely, 2^21841398 is an apocalyptic number.

21841398 is an abundant number, since it is smaller than the sum of its proper divisors (27540090).

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

21841398 is a wasteful number, since it uses less digits than its factorization.

21841398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52788 (or 52785 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 21841398 is about 4673.4781480178. The cubic root of 21841398 is about 279.5289614267.

It can be divided in two parts, 218 and 41398, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 21841398 in words is "twenty-one million, eight hundred forty-one thousand, three hundred ninety-eight".