21023258 has 8 divisors (see below), whose sum is σ = 31661280. Its totient is φ = 10469500.

The previous prime is 21023257. The next prime is 21023263. The reversal of 21023258 is 85232012.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21023257) 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, 20438 + ... + 21441.

It is an arithmetic number, because the mean of its divisors is an integer number (3957660).

Almost surely, 2^21023258 is an apocalyptic number.

21023258 is a deficient number, since it is larger than the sum of its proper divisors (10638022).

21023258 is a wasteful number, since it uses less digits than its factorization.

21023258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42132.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21023258 is about 4585.1126485616. The cubic root of 21023258 is about 275.9942325337.

The spelling of 21023258 in words is "twenty-one million, twenty-three thousand, two hundred fifty-eight".