21072652 has 6 divisors (see below), whose sum is σ = 36877148. Its totient is φ = 10536324.

The previous prime is 21072629. The next prime is 21072659. The reversal of 21072652 is 25627012.

It is not an unprimeable number, because it can be changed into a prime (21072659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2634078 + ... + 2634085.

Almost surely, 2^21072652 is an apocalyptic number.

It is an amenable number.

21072652 is a deficient number, since it is larger than the sum of its proper divisors (15804496).

21072652 is a wasteful number, since it uses less digits than its factorization.

21072652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5268167 (or 5268165 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21072652 is about 4590.4958337853. The cubic root of 21072652 is about 276.2102123242.

Adding to 21072652 its reverse (25627012), we get a palindrome (46699664).

The spelling of 21072652 in words is "twenty-one million, seventy-two thousand, six hundred fifty-two".