21641346 has 24 divisors (see below), whose sum is σ = 46994220. Its totient is φ = 7197696.

The previous prime is 21641311. The next prime is 21641353. The reversal of 21641346 is 64314612.

It can be written as a sum of positive squares in 2 ways, for example, as 15515721 + 6125625 = 3939^2 + 2475^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9186 + ... + 11298.

Almost surely, 2^21641346 is an apocalyptic number.

21641346 is an abundant number, since it is smaller than the sum of its proper divisors (25352874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21641346 is a wasteful number, since it uses less digits than its factorization.

21641346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690 (or 2687 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21641346 is about 4652.0260102454. The cubic root of 21641346 is about 278.6729122501.

Adding to 21641346 its reverse (64314612), we get a palindrome (85955958).

The spelling of 21641346 in words is "twenty-one million, six hundred forty-one thousand, three hundred forty-six".