21258002 has 8 divisors (see below), whose sum is σ = 32915712. Its totient is φ = 10286100.

The previous prime is 21258001. The next prime is 21258023. The reversal of 21258002 is 20085212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21258001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171374 + ... + 171497.

It is an arithmetic number, because the mean of its divisors is an integer number (4114464).

Almost surely, 2^21258002 is an apocalyptic number.

21258002 is a deficient number, since it is larger than the sum of its proper divisors (11657710).

21258002 is a wasteful number, since it uses less digits than its factorization.

21258002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342904.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 21258002 is about 4610.6400857148. The cubic root of 21258002 is about 277.0176758043.

The spelling of 21258002 in words is "twenty-one million, two hundred fifty-eight thousand, two".