21411308 has 12 divisors (see below), whose sum is σ = 38482752. Its totient is φ = 10416240.

The previous prime is 21411301. The next prime is 21411317. The reversal of 21411308 is 80311412.

It is a super-2 number, since 2×21411308² = 916888220541728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21411308.

It is not an unprimeable number, because it can be changed into a prime (21411301) 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, 72188 + ... + 72483.

It is an arithmetic number, because the mean of its divisors is an integer number (3206896).

Almost surely, 2^21411308 is an apocalyptic number.

It is an amenable number.

21411308 is a deficient number, since it is larger than the sum of its proper divisors (17071444).

21411308 is a wasteful number, since it uses less digits than its factorization.

21411308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144712 (or 144710 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21411308 is about 4627.2354597535. The cubic root of 21411308 is about 277.6820027267.

The spelling of 21411308 in words is "twenty-one million, four hundred eleven thousand, three hundred eight".