21145652 has 12 divisors (see below), whose sum is σ = 40369056. Its totient is φ = 9611640.

The previous prime is 21145639. The next prime is 21145667. The reversal of 21145652 is 25654112.

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, 240248 + ... + 240335.

It is an arithmetic number, because the mean of its divisors is an integer number (3364088).

Almost surely, 2^21145652 is an apocalyptic number.

21145652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21145652 is a deficient number, since it is larger than the sum of its proper divisors (19223404).

21145652 is a wasteful number, since it uses less digits than its factorization.

21145652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480598 (or 480596 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 21145652 is about 4598.4401703186. The cubic root of 21145652 is about 276.5287943879.

Adding to 21145652 its reverse (25654112), we get a palindrome (46799764).

The spelling of 21145652 in words is "twenty-one million, one hundred forty-five thousand, six hundred fifty-two".