21217482 has 48 divisors (see below), whose sum is σ = 54014688. Its totient is φ = 5934240.

The previous prime is 21217481. The next prime is 21217499. The reversal of 21217482 is 28471212.

It is not an unprimeable number, because it can be changed into a prime (21217481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1548 + ... + 6695.

It is an arithmetic number, because the mean of its divisors is an integer number (1125306).

Almost surely, 2^21217482 is an apocalyptic number.

21217482 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21217482 is an abundant number, since it is smaller than the sum of its proper divisors (32797206).

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

21217482 is a wasteful number, since it uses less digits than its factorization.

21217482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8275 (or 8272 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 21217482 is about 4606.2438059660. The cubic root of 21217482 is about 276.8415555266.

Adding to 21217482 its reverse (28471212), we get a palindrome (49688694).

The spelling of 21217482 in words is "twenty-one million, two hundred seventeen thousand, four hundred eighty-two".