21350830 has 8 divisors (see below), whose sum is σ = 38431512. Its totient is φ = 8540328.

The previous prime is 21350809. The next prime is 21350839. The reversal of 21350830 is 3805312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067532 + ... + 1067551.

It is an arithmetic number, because the mean of its divisors is an integer number (4803939).

Almost surely, 2^21350830 is an apocalyptic number.

21350830 is a deficient number, since it is larger than the sum of its proper divisors (17080682).

21350830 is a wasteful number, since it uses less digits than its factorization.

21350830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135090.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21350830 is about 4620.6958350448. The cubic root of 21350830 is about 277.4203109654.

The spelling of 21350830 in words is "twenty-one million, three hundred fifty thousand, eight hundred thirty".