21541308 has 12 divisors (see below), whose sum is σ = 50263080. Its totient is φ = 7180432.

The previous prime is 21541301. The next prime is 21541337. The reversal of 21541308 is 80314512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541301) 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, 897543 + ... + 897566.

It is an arithmetic number, because the mean of its divisors is an integer number (4188590).

Almost surely, 2^21541308 is an apocalyptic number.

It is an amenable number.

21541308 is an abundant number, since it is smaller than the sum of its proper divisors (28721772).

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

21541308 is a wasteful number, since it uses less digits than its factorization.

21541308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795116 (or 1795114 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21541308 is about 4641.2614664550. The cubic root of 21541308 is about 278.2428566366.

The spelling of 21541308 in words is "twenty-one million, five hundred forty-one thousand, three hundred eight".