21752482 has 4 divisors (see below), whose sum is σ = 32628726. Its totient is φ = 10876240.

The previous prime is 21752461. The next prime is 21752519. The reversal of 21752482 is 28425712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 2047761 = 4439^2 + 1431^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5438119 + ... + 5438122.

Almost surely, 2^21752482 is an apocalyptic number.

21752482 is a deficient number, since it is larger than the sum of its proper divisors (10876244).

21752482 is a wasteful number, since it uses less digits than its factorization.

21752482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10876243.

The product of its digits is 8960, while the sum is 31.

The square root of 21752482 is about 4663.9556172845. The cubic root of 21752482 is about 279.1491261373.

The spelling of 21752482 in words is "twenty-one million, seven hundred fifty-two thousand, four hundred eighty-two".