21030752 has 24 divisors (see below), whose sum is σ = 41644512. Its totient is φ = 10454400.

The previous prime is 21030721. The next prime is 21030767. The reversal of 21030752 is 25703012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3977 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (1735188).

Almost surely, 2^21030752 is an apocalyptic number.

It is an amenable number.

21030752 is a deficient number, since it is larger than the sum of its proper divisors (20613760).

21030752 is a wasteful number, since it uses less digits than its factorization.

21030752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822 (or 3814 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 21030752 is about 4585.9297857686. The cubic root of 21030752 is about 276.0270224890.

Adding to 21030752 its reverse (25703012), we get a palindrome (46733764).

The spelling of 21030752 in words is "twenty-one million, thirty thousand, seven hundred fifty-two".