21041386 has 8 divisors (see below), whose sum is σ = 31654080. Its totient is φ = 10490028.

The previous prime is 21041381. The next prime is 21041387. The reversal of 21041386 is 68314012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21041386.

It is not an unprimeable number, because it can be changed into a prime (21041381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14466 + ... + 15853.

It is an arithmetic number, because the mean of its divisors is an integer number (3956760).

Almost surely, 2^21041386 is an apocalyptic number.

21041386 is a deficient number, since it is larger than the sum of its proper divisors (10612694).

21041386 is a wasteful number, since it uses less digits than its factorization.

21041386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30668.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21041386 is about 4587.0890551634. The cubic root of 21041386 is about 276.0735381305.

Adding to 21041386 its reverse (68314012), we get a palindrome (89355398).

The spelling of 21041386 in words is "twenty-one million, forty-one thousand, three hundred eighty-six".