21358732 has 24 divisors (see below), whose sum is σ = 40944960. Its totient is φ = 9703680.

The previous prime is 21358699. The next prime is 21358739. The reversal of 21358732 is 23785312.

It is a junction number, because it is equal to n+sod(n) for n = 21358694 and 21358703.

It is not an unprimeable number, because it can be changed into a prime (21358739) 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 7 ways as a sum of consecutive naturals, for example, 3444 + ... + 7387.

It is an arithmetic number, because the mean of its divisors is an integer number (1706040).

Almost surely, 2^21358732 is an apocalyptic number.

It is an amenable number.

21358732 is a deficient number, since it is larger than the sum of its proper divisors (19586228).

21358732 is a wasteful number, since it uses less digits than its factorization.

21358732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10881 (or 10879 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 21358732 is about 4621.5508219644. The cubic root of 21358732 is about 277.4545314135.

The spelling of 21358732 in words is "twenty-one million, three hundred fifty-eight thousand, seven hundred thirty-two".