21241508 has 12 divisors (see below), whose sum is σ = 37401840. Its totient is φ = 10555272.

The previous prime is 21241501. The next prime is 21241511. The reversal of 21241508 is 80514212.

It is a super-2 number, since 2×21241508² = 902403324228128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21241501) 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, 15638 + ... + 16941.

It is an arithmetic number, because the mean of its divisors is an integer number (3116820).

Almost surely, 2^21241508 is an apocalyptic number.

It is an amenable number.

21241508 is a deficient number, since it is larger than the sum of its proper divisors (16160332).

21241508 is a wasteful number, since it uses less digits than its factorization.

21241508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32746 (or 32744 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21241508 is about 4608.8510498822. The cubic root of 21241508 is about 276.9460116254.

The spelling of 21241508 in words is "twenty-one million, two hundred forty-one thousand, five hundred eight".