21741772 has 24 divisors (see below), whose sum is σ = 41143536. Its totient is φ = 9993408.

The previous prime is 21741749. The next prime is 21741781. The reversal of 21741772 is 27714712.

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, 14523 + ... + 15949.

It is an arithmetic number, because the mean of its divisors is an integer number (1714314).

Almost surely, 2^21741772 is an apocalyptic number.

It is an amenable number.

21741772 is a deficient number, since it is larger than the sum of its proper divisors (19401764).

21741772 is a wasteful number, since it uses less digits than its factorization.

21741772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1735 counting only the distinct ones).

The product of its digits is 5488, while the sum is 31.

The square root of 21741772 is about 4662.8073089074. The cubic root of 21741772 is about 279.1033048844.

The spelling of 21741772 in words is "twenty-one million, seven hundred forty-one thousand, seven hundred seventy-two".