21358084 has 12 divisors (see below), whose sum is σ = 40774608. Its totient is φ = 9708200.

The previous prime is 21358079. The next prime is 21358087. The reversal of 21358084 is 48085312.

It is not an unprimeable number, because it can be changed into a prime (21358087) 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, 242662 + ... + 242749.

It is an arithmetic number, because the mean of its divisors is an integer number (3397884).

Almost surely, 2^21358084 is an apocalyptic number.

It is an amenable number.

21358084 is a deficient number, since it is larger than the sum of its proper divisors (19416524).

21358084 is a wasteful number, since it uses less digits than its factorization.

21358084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485426 (or 485424 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21358084 is about 4621.4807150955. The cubic root of 21358084 is about 277.4517254986.

The spelling of 21358084 in words is "twenty-one million, three hundred fifty-eight thousand, eighty-four".