21150219 has 16 divisors (see below), whose sum is σ = 29028384. Its totient is φ = 13689600.

The previous prime is 21150209. The next prime is 21150223. The reversal of 21150219 is 91205112.

It is not a de Polignac number, because 21150219 - 2⁴ = 21150203 is a prime.

It is a super-2 number, since 2×21150219² = 894663527495922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21150195 and 21150204.

It is not an unprimeable number, because it can be changed into a prime (21150209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45649 + ... + 46109.

It is an arithmetic number, because the mean of its divisors is an integer number (1814274).

Almost surely, 2^21150219 is an apocalyptic number.

21150219 is a deficient number, since it is larger than the sum of its proper divisors (7878165).

21150219 is a wasteful number, since it uses less digits than its factorization.

21150219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21150219 is about 4598.9367249398. The cubic root of 21150219 is about 276.5487010192.

The spelling of 21150219 in words is "twenty-one million, one hundred fifty thousand, two hundred nineteen".