21398082 has 16 divisors (see below), whose sum is σ = 42848352. Its totient is φ = 7124000.

The previous prime is 21398081. The next prime is 21398101. The reversal of 21398082 is 28089312.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21398081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4957 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (2678022).

Almost surely, 2^21398082 is an apocalyptic number.

21398082 is an abundant number, since it is smaller than the sum of its proper divisors (21450270).

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

21398082 is a wasteful number, since it uses less digits than its factorization.

21398082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4353.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21398082 is about 4625.8060919152. The cubic root of 21398082 is about 277.6248152095.

The spelling of 21398082 in words is "twenty-one million, three hundred ninety-eight thousand, eighty-two".