21430930 has 8 divisors (see below), whose sum is σ = 38575692. Its totient is φ = 8572368.

The previous prime is 21430909. The next prime is 21430949. The reversal of 21430930 is 3903412.

It can be written as a sum of positive squares in 2 ways, for example, as 20820969 + 609961 = 4563^2 + 781^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071537 + ... + 1071556.

Almost surely, 2^21430930 is an apocalyptic number.

21430930 is a deficient number, since it is larger than the sum of its proper divisors (17144762).

21430930 is a wasteful number, since it uses less digits than its factorization.

21430930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143100.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21430930 is about 4629.3552466839. The cubic root of 21430930 is about 277.7668023515.

The spelling of 21430930 in words is "twenty-one million, four hundred thirty thousand, nine hundred thirty".