21550264 has 32 divisors (see below), whose sum is σ = 42469920. Its totient is φ = 10231936.

The previous prime is 21550259. The next prime is 21550273. The reversal of 21550264 is 46205512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31494 + ... + 32170.

It is an arithmetic number, because the mean of its divisors is an integer number (1327185).

Almost surely, 2^21550264 is an apocalyptic number.

It is an amenable number.

21550264 is a deficient number, since it is larger than the sum of its proper divisors (20919656).

21550264 is a wasteful number, since it uses less digits than its factorization.

21550264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 21550264 is about 4642.2261900946. The cubic root of 21550264 is about 278.2814119826.

Adding to 21550264 its reverse (46205512), we get a palindrome (67755776).

The spelling of 21550264 in words is "twenty-one million, five hundred fifty thousand, two hundred sixty-four".