21650343 has 32 divisors (see below), whose sum is σ = 34298880. Its totient is φ = 11975040.

The previous prime is 21650339. The next prime is 21650351. The reversal of 21650343 is 34305612.

It is a happy number.

It is not a de Polignac number, because 21650343 - 2² = 21650339 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46530 + ... + 46992.

It is an arithmetic number, because the mean of its divisors is an integer number (1071840).

Almost surely, 2^21650343 is an apocalyptic number.

21650343 is a deficient number, since it is larger than the sum of its proper divisors (12648537).

21650343 is a wasteful number, since it uses less digits than its factorization.

21650343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21650343 is about 4652.9929077960. The cubic root of 21650343 is about 278.7115246486.

Adding to 21650343 its reverse (34305612), we get a palindrome (55955955).

The spelling of 21650343 in words is "twenty-one million, six hundred fifty thousand, three hundred forty-three".