21141355 has 4 divisors (see below), whose sum is σ = 25369632. Its totient is φ = 16913080.

The previous prime is 21141317. The next prime is 21141361. The reversal of 21141355 is 55314112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21141355 - 2⁷ = 21141227 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 3 ways as a sum of consecutive naturals, for example, 2114131 + ... + 2114140.

It is an arithmetic number, because the mean of its divisors is an integer number (6342408).

Almost surely, 2^21141355 is an apocalyptic number.

21141355 is a deficient number, since it is larger than the sum of its proper divisors (4228277).

21141355 is an equidigital number, since it uses as much as digits as its factorization.

21141355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228276.

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

The square root of 21141355 is about 4597.9729229303. The cubic root of 21141355 is about 276.5100620148.

Adding to 21141355 its reverse (55314112), we get a palindrome (76455467).

It can be divided in two parts, 21 and 141355, that added together give a square (141376 = 376²).

The spelling of 21141355 in words is "twenty-one million, one hundred forty-one thousand, three hundred fifty-five".