21025672 has 16 divisors (see below), whose sum is σ = 40012560. Its totient is φ = 10355664.

The previous prime is 21025639. The next prime is 21025681. The reversal of 21025672 is 27652012.

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, 19078 + ... + 20149.

It is an arithmetic number, because the mean of its divisors is an integer number (2500785).

Almost surely, 2^21025672 is an apocalyptic number.

It is an amenable number.

21025672 is a deficient number, since it is larger than the sum of its proper divisors (18986888).

21025672 is a wasteful number, since it uses less digits than its factorization.

21025672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39300 (or 39296 counting only the distinct ones).

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

The square root of 21025672 is about 4585.3758842651. The cubic root of 21025672 is about 276.0047958279.

Adding to 21025672 its reverse (27652012), we get a palindrome (48677684).

The spelling of 21025672 in words is "twenty-one million, twenty-five thousand, six hundred seventy-two".