21030512 has 20 divisors (see below), whose sum is σ = 40844856. Its totient is φ = 10489920.

The previous prime is 21030469. The next prime is 21030551. The reversal of 21030512 is 21503012.

It is a happy number.

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, 6518 + ... + 9194.

Almost surely, 2^21030512 is an apocalyptic number.

It is an amenable number.

21030512 is a deficient number, since it is larger than the sum of its proper divisors (19814344).

21030512 is a wasteful number, since it uses less digits than its factorization.

21030512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 3170 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21030512 is about 4585.9036186994. The cubic root of 21030512 is about 276.0259724911.

Adding to 21030512 its reverse (21503012), we get a palindrome (42533524).

The spelling of 21030512 in words is "twenty-one million, thirty thousand, five hundred twelve".