21549068 has 24 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 10157840.

The previous prime is 21549049. The next prime is 21549071. The reversal of 21549068 is 86094512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4883 + ... + 8181.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^21549068 is an apocalyptic number.

It is an amenable number.

21549068 is a deficient number, since it is larger than the sum of its proper divisors (18367732).

21549068 is a wasteful number, since it uses less digits than its factorization.

21549068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3395 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21549068 is about 4642.0973708013. The cubic root of 21549068 is about 278.2762638520.

The spelling of 21549068 in words is "twenty-one million, five hundred forty-nine thousand, sixty-eight".