21147032 has 16 divisors (see below), whose sum is σ = 41018400. Its totient is φ = 10208800.

The previous prime is 21147029. The next prime is 21147037. The reversal of 21147032 is 23074112.

It is a junction number, because it is equal to n+sod(n) for n = 21146995 and 21147013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147037) by changing a digit.

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, 45344 + ... + 45807.

It is an arithmetic number, because the mean of its divisors is an integer number (2563650).

Almost surely, 2^21147032 is an apocalyptic number.

It is an amenable number.

21147032 is a deficient number, since it is larger than the sum of its proper divisors (19871368).

21147032 is a wasteful number, since it uses less digits than its factorization.

21147032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91186 (or 91182 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21147032 is about 4598.5902187518. The cubic root of 21147032 is about 276.5348098316.

The spelling of 21147032 in words is "twenty-one million, one hundred forty-seven thousand, thirty-two".