21829264 has 10 divisors (see below), whose sum is σ = 42294230. Its totient is φ = 10914624.

The previous prime is 21829259. The next prime is 21829273. The reversal of 21829264 is 46292812.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 1937664 = 4460^2 + 1392^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682149 + ... + 682180.

It is an arithmetic number, because the mean of its divisors is an integer number (4229423).

Almost surely, 2^21829264 is an apocalyptic number.

It is an amenable number.

21829264 is a deficient number, since it is larger than the sum of its proper divisors (20464966).

21829264 is a wasteful number, since it uses less digits than its factorization.

21829264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364337 (or 1364331 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 21829264 is about 4672.1797910611. The cubic root of 21829264 is about 279.4771876846.

The spelling of 21829264 in words is "twenty-one million, eight hundred twenty-nine thousand, two hundred sixty-four".