21589748 has 12 divisors (see below), whose sum is σ = 37837632. Its totient is φ = 10779000.

The previous prime is 21589747. The next prime is 21589769. The reversal of 21589748 is 84798512.

It is a super-2 number, since 2×21589748² = 932234437407008, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21589699 and 21589708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21589747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (3153136).

Almost surely, 2^21589748 is an apocalyptic number.

It is an amenable number.

21589748 is a deficient number, since it is larger than the sum of its proper divisors (16247884).

21589748 is a wasteful number, since it uses less digits than its factorization.

21589748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7942 (or 7940 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 21589748 is about 4646.4769449552. The cubic root of 21589748 is about 278.4512623323.

The spelling of 21589748 in words is "twenty-one million, five hundred eighty-nine thousand, seven hundred forty-eight".