21234830 has 8 divisors (see below), whose sum is σ = 38222712. Its totient is φ = 8493928.

The previous prime is 21234817. The next prime is 21234833. The reversal of 21234830 is 3843212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21234796 and 21234805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234833) 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, 1061732 + ... + 1061751.

It is an arithmetic number, because the mean of its divisors is an integer number (4777839).

Almost surely, 2^21234830 is an apocalyptic number.

21234830 is a deficient number, since it is larger than the sum of its proper divisors (16987882).

21234830 is a wasteful number, since it uses less digits than its factorization.

21234830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123490.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21234830 is about 4608.1265173604. The cubic root of 21234830 is about 276.9169860761.

The spelling of 21234830 in words is "twenty-one million, two hundred thirty-four thousand, eight hundred thirty".