21752514 has 48 divisors (see below), whose sum is σ = 55610880. Its totient is φ = 6013440.

The previous prime is 21752461. The next prime is 21752519. The reversal of 21752514 is 41525712.

It is not an unprimeable number, because it can be changed into a prime (21752519) 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 23 ways as a sum of consecutive naturals, for example, 1122 + ... + 6690.

It is an arithmetic number, because the mean of its divisors is an integer number (1158560).

Almost surely, 2^21752514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21752514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27805440).

21752514 is an abundant number, since it is smaller than the sum of its proper divisors (33858366).

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

21752514 is a wasteful number, since it uses less digits than its factorization.

21752514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615 (or 5612 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 21752514 is about 4663.9590478477. The cubic root of 21752514 is about 279.1492630224.

The spelling of 21752514 in words is "twenty-one million, seven hundred fifty-two thousand, five hundred fourteen".