21325772 has 18 divisors (see below), whose sum is σ = 40412988. Its totient is φ = 9842352.

The previous prime is 21325757. The next prime is 21325819. The reversal of 21325772 is 27752312.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15098 + ... + 16449.

It is an arithmetic number, because the mean of its divisors is an integer number (2245166).

Almost surely, 2^21325772 is an apocalyptic number.

It is an amenable number.

21325772 is a deficient number, since it is larger than the sum of its proper divisors (19087216).

21325772 is a wasteful number, since it uses less digits than its factorization.

21325772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31577 (or 31562 counting only the distinct ones).

The product of its digits is 5880, while the sum is 29.

The square root of 21325772 is about 4617.9835426298. The cubic root of 21325772 is about 277.3117387700.

The spelling of 21325772 in words is "twenty-one million, three hundred twenty-five thousand, seven hundred seventy-two".