21727532 has 12 divisors (see below), whose sum is σ = 38192280. Its totient is φ = 10815456.

The previous prime is 21727493. The next prime is 21727543. The reversal of 21727532 is 23572712.

It is a super-2 number, since 2×21727532² = 944171293622048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21727495 and 21727504.

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 3 ways as a sum of consecutive naturals, for example, 11057 + ... + 12872.

It is an arithmetic number, because the mean of its divisors is an integer number (3182690).

Almost surely, 2^21727532 is an apocalyptic number.

It is an amenable number.

21727532 is a deficient number, since it is larger than the sum of its proper divisors (16464748).

21727532 is a wasteful number, since it uses less digits than its factorization.

21727532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24160 (or 24158 counting only the distinct ones).

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

The square root of 21727532 is about 4661.2800816943. The cubic root of 21727532 is about 279.0423577044.

The spelling of 21727532 in words is "twenty-one million, seven hundred twenty-seven thousand, five hundred thirty-two".