21616248 has 32 divisors (see below), whose sum is σ = 57220560. Its totient is φ = 6781440.

The previous prime is 21616241. The next prime is 21616279. The reversal of 21616248 is 84261612.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26083 + ... + 26898.

Almost surely, 2^21616248 is an apocalyptic number.

It is an amenable number.

21616248 is an abundant number, since it is smaller than the sum of its proper divisors (35604312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21616248 is a wasteful number, since it uses less digits than its factorization.

21616248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53007 (or 53003 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 21616248 is about 4649.3276933337. The cubic root of 21616248 is about 278.5651426402.

The spelling of 21616248 in words is "twenty-one million, six hundred sixteen thousand, two hundred forty-eight".