21514248 has 224 divisors, whose sum is σ = 75548160. Its totient is φ = 5598720.

The previous prime is 21514247. The next prime is 21514249. The reversal of 21514248 is 84241512.

It is an interprime number because it is at equal distance from previous prime (21514247) and next prime (21514249).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (21514247) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 693993 + ... + 694023.

Almost surely, 2^21514248 is an apocalyptic number.

21514248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21514248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37774080).

21514248 is an abundant number, since it is smaller than the sum of its proper divisors (54033912).

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

21514248 is a wasteful number, since it uses less digits than its factorization.

21514248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 60 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21514248 is about 4638.3453946424. The cubic root of 21514248 is about 278.1262990807.

The spelling of 21514248 in words is "twenty-one million, five hundred fourteen thousand, two hundred forty-eight".