21700248 has 32 divisors (see below), whose sum is σ = 56002560. Its totient is φ = 6999840.

The previous prime is 21700243. The next prime is 21700253. The reversal of 21700248 is 84200712.

It is an interprime number because it is at equal distance from previous prime (21700243) and next prime (21700253).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13840 + ... + 15327.

It is an arithmetic number, because the mean of its divisors is an integer number (1750080).

Almost surely, 2^21700248 is an apocalyptic number.

It is an amenable number.

21700248 is an abundant number, since it is smaller than the sum of its proper divisors (34302312).

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

21700248 is a wasteful number, since it uses less digits than its factorization.

21700248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29207 (or 29203 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21700248 is about 4658.3524984698. The cubic root of 21700248 is about 278.9255077908.

The spelling of 21700248 in words is "twenty-one million, seven hundred thousand, two hundred forty-eight".