21650264 has 8 divisors (see below), whose sum is σ = 40594260. Its totient is φ = 10825128.

The previous prime is 21650263. The next prime is 21650281. The reversal of 21650264 is 46205612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1353134 + ... + 1353149.

Almost surely, 2^21650264 is an apocalyptic number.

It is an amenable number.

21650264 is a deficient number, since it is larger than the sum of its proper divisors (18943996).

21650264 is a wasteful number, since it uses less digits than its factorization.

21650264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706289 (or 2706285 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21650264 is about 4652.9844186285. The cubic root of 21650264 is about 278.7111856511.

Adding to 21650264 its reverse (46205612), we get a palindrome (67855876).

The spelling of 21650264 in words is "twenty-one million, six hundred fifty thousand, two hundred sixty-four".