21341155 has 16 divisors (see below), whose sum is σ = 28399968. Its totient is φ = 15264000.

The previous prime is 21341147. The next prime is 21341179. The reversal of 21341155 is 55114312.

It is a happy number.

It is not a de Polignac number, because 21341155 - 2³ = 21341147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 6535.

It is an arithmetic number, because the mean of its divisors is an integer number (1774998).

Almost surely, 2^21341155 is an apocalyptic number.

21341155 is a deficient number, since it is larger than the sum of its proper divisors (7058813).

21341155 is a wasteful number, since it uses less digits than its factorization.

21341155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6438.

The product of its digits is 600, while the sum is 22.

The square root of 21341155 is about 4619.6487961749. The cubic root of 21341155 is about 277.3784008534.

Adding to 21341155 its reverse (55114312), we get a palindrome (76455467).

The spelling of 21341155 in words is "twenty-one million, three hundred forty-one thousand, one hundred fifty-five".