21326346 has 12 divisors (see below), whose sum is σ = 46207122. Its totient is φ = 7108776.

The previous prime is 21326309. The next prime is 21326351. The reversal of 21326346 is 64362312.

21326346 is a `hidden beast` number, since 21 + 3 + 2 + 634 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 65025 = 4611^2 + 255^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592381 + ... + 592416.

Almost surely, 2^21326346 is an apocalyptic number.

21326346 is an abundant number, since it is smaller than the sum of its proper divisors (24880776).

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

21326346 is a wasteful number, since it uses less digits than its factorization.

21326346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184805 (or 1184802 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 21326346 is about 4618.0456905492. The cubic root of 21326346 is about 277.3142267692.

Adding to 21326346 its reverse (64362312), we get a palindrome (85688658).

The spelling of 21326346 in words is "twenty-one million, three hundred twenty-six thousand, three hundred forty-six".