21430858 has 8 divisors (see below), whose sum is σ = 33183360. Its totient is φ = 10369740.

The previous prime is 21430847. The next prime is 21430859. The reversal of 21430858 is 85803412.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (21430859) 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, 172768 + ... + 172891.

It is an arithmetic number, because the mean of its divisors is an integer number (4147920).

Almost surely, 2^21430858 is an apocalyptic number.

21430858 is a deficient number, since it is larger than the sum of its proper divisors (11752502).

21430858 is a wasteful number, since it uses less digits than its factorization.

21430858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345692.

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

The square root of 21430858 is about 4629.3474702165. The cubic root of 21430858 is about 277.7664912866.

The spelling of 21430858 in words is "twenty-one million, four hundred thirty thousand, eight hundred fifty-eight".