21155341 has 8 divisors (see below), whose sum is σ = 22373120.
Its totient is φ = 19948032.
The previous prime is 21155339. The next prime is 21155363. The reversal of 21155341 is 14355112.
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 21155341 - 21 = 21155339 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21155371) 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, 1741 + ... + 6733.
It is an arithmetic number, because the mean of its divisors is an integer number (2796640).
Almost surely, 221155341 is an apocalyptic number.
It is an amenable number.
21155341 is a deficient number, since it is larger than the sum of its proper divisors (1217779).
21155341 is a wasteful number, since it uses less digits than its factorization.
21155341 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5235.
The product of its digits is 600, while the sum is 22.
The square root of 21155341 is about 4599.4935590780.
The cubic root of 21155341 is about 276.5710233746.
The spelling of 21155341 in words is "twenty-one million, one hundred fifty-five thousand, three hundred forty-one".