21814248 has 16 divisors (see below), whose sum is σ = 54535680. Its totient is φ = 7271408.

The previous prime is 21814241. The next prime is 21814249. The reversal of 21814248 is 84241812.

It is a super-2 number, since 2×21814248² = 951722831611008, which contains 22 as substring.

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 (21814241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454440 + ... + 454487.

It is an arithmetic number, because the mean of its divisors is an integer number (3408480).

Almost surely, 2^21814248 is an apocalyptic number.

It is an amenable number.

21814248 is an abundant number, since it is smaller than the sum of its proper divisors (32721432).

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

21814248 is a wasteful number, since it uses less digits than its factorization.

21814248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908936 (or 908932 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 21814248 is about 4670.5725559079. The cubic root of 21814248 is about 279.4130903627.

The spelling of 21814248 in words is "twenty-one million, eight hundred fourteen thousand, two hundred forty-eight".