21200930 has 8 divisors (see below), whose sum is σ = 38161692. Its totient is φ = 8480368.

The previous prime is 21200923. The next prime is 21200983. The reversal of 21200930 is 3900212.

It can be written as a sum of positive squares in 2 ways, for example, as 17986081 + 3214849 = 4241^2 + 1793^2 .

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

It is a super-3 number, since 3×21200930³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21200899 and 21200908.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060037 + ... + 1060056.

Almost surely, 2^21200930 is an apocalyptic number.

21200930 is a deficient number, since it is larger than the sum of its proper divisors (16960762).

21200930 is a wasteful number, since it uses less digits than its factorization.

21200930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120100.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21200930 is about 4604.4467637274. The cubic root of 21200930 is about 276.7695477124.

The spelling of 21200930 in words is "twenty-one million, two hundred thousand, nine hundred thirty".