21350859 has 8 divisors (see below), whose sum is σ = 28692480. Its totient is φ = 14121576.

The previous prime is 21350839. The next prime is 21350863. The reversal of 21350859 is 95805312.

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

It is not a de Polignac number, because 21350859 - 2¹⁵ = 21318091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21350809) 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 7 ways as a sum of consecutive naturals, for example, 27639 + ... + 28400.

It is an arithmetic number, because the mean of its divisors is an integer number (3586560).

Almost surely, 2^21350859 is an apocalyptic number.

21350859 is a deficient number, since it is larger than the sum of its proper divisors (7341621).

21350859 is a wasteful number, since it uses less digits than its factorization.

21350859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56169.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 21350859 is about 4620.6989730992. The cubic root of 21350859 is about 277.4204365684.

The spelling of 21350859 in words is "twenty-one million, three hundred fifty thousand, eight hundred fifty-nine".