21554248 has 8 divisors (see below), whose sum is σ = 40414230. Its totient is φ = 10777120.

The previous prime is 21554237. The next prime is 21554257. The reversal of 21554248 is 84245512.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 6084 = 4642^2 + 78^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1347133 + ... + 1347148.

Almost surely, 2^21554248 is an apocalyptic number.

It is an amenable number.

21554248 is a deficient number, since it is larger than the sum of its proper divisors (18859982).

21554248 is a wasteful number, since it uses less digits than its factorization.

21554248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694287 (or 2694283 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

The square root of 21554248 is about 4642.6552747323. The cubic root of 21554248 is about 278.2985595658.

The spelling of 21554248 in words is "twenty-one million, five hundred fifty-four thousand, two hundred forty-eight".