21024652 has 24 divisors (see below), whose sum is σ = 41524560. Its totient is φ = 9226560.

The previous prime is 21024643. The next prime is 21024743. The reversal of 21024652 is 25642012.

It is a super-2 number, since 2×21024652² = 884071983442208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6963 + ... + 9514.

It is an arithmetic number, because the mean of its divisors is an integer number (1730190).

Almost surely, 2^21024652 is an apocalyptic number.

21024652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21024652 is a deficient number, since it is larger than the sum of its proper divisors (20499908).

21024652 is a wasteful number, since it uses less digits than its factorization.

21024652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16521 (or 16519 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21024652 is about 4585.2646597552. The cubic root of 21024652 is about 276.0003325628. Note that the first 3 decimals are identical.

Adding to 21024652 its reverse (25642012), we get a palindrome (46666664).

The spelling of 21024652 in words is "twenty-one million, twenty-four thousand, six hundred fifty-two".