21750152 has 16 divisors (see below), whose sum is σ = 41043660. Its totient is φ = 10805184.

The previous prime is 21750151. The next prime is 21750161. The reversal of 21750152 is 25105712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21585316 + 164836 = 4646^2 + 406^2 .

It is a super-2 number, since 2×21750152² = 946138224046208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21750151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7403 + ... + 9914.

Almost surely, 2^21750152 is an apocalyptic number.

It is an amenable number.

21750152 is a deficient number, since it is larger than the sum of its proper divisors (19293508).

21750152 is a wasteful number, since it uses less digits than its factorization.

21750152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17480 (or 17476 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 21750152 is about 4663.7058226265. The cubic root of 21750152 is about 279.1391588351.

Adding to 21750152 its reverse (25105712), we get a palindrome (46855864).

The spelling of 21750152 in words is "twenty-one million, seven hundred fifty thousand, one hundred fifty-two".