21135741 has 8 divisors (see below), whose sum is σ = 30742944. Its totient is φ = 12809520.

The previous prime is 21135731. The next prime is 21135761. The reversal of 21135741 is 14753112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21135741 - 2⁶ = 21135677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135731) 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, 320206 + ... + 320271.

It is an arithmetic number, because the mean of its divisors is an integer number (3842868).

Almost surely, 2^21135741 is an apocalyptic number.

It is an amenable number.

21135741 is a deficient number, since it is larger than the sum of its proper divisors (9607203).

21135741 is a wasteful number, since it uses less digits than its factorization.

21135741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640491.

The product of its digits is 840, while the sum is 24.

The square root of 21135741 is about 4597.3623959832. The cubic root of 21135741 is about 276.4855844776.

Adding to 21135741 its reverse (14753112), we get a palindrome (35888853).

The spelling of 21135741 in words is "twenty-one million, one hundred thirty-five thousand, seven hundred forty-one".