21598472 has 64 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 8616960.

The previous prime is 21598469. The next prime is 21598477. The reversal of 21598472 is 27489512.

It is not an unprimeable number, because it can be changed into a prime (21598477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52604 + ... + 53012.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^21598472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21598472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24796800).

21598472 is an abundant number, since it is smaller than the sum of its proper divisors (27995128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21598472 is a wasteful number, since it uses less digits than its factorization.

21598472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 482 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 21598472 is about 4647.4156259151. The cubic root of 21598472 is about 278.4887628733.

It can be divided in two parts, 2 and 1598472, that multiplied together give a square (3196944 = 1788²).

The spelling of 21598472 in words is "twenty-one million, five hundred ninety-eight thousand, four hundred seventy-two".