21150211 has 8 divisors (see below), whose sum is σ = 22365200. Its totient is φ = 19945440.

The previous prime is 21150209. The next prime is 21150223. The reversal of 21150211 is 11205112.

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

It is not a de Polignac number, because 21150211 - 2¹ = 21150209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21150191 and 21150200.

It is not an unprimeable number, because it can be changed into a prime (21150011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1921 + ... + 6781.

It is an arithmetic number, because the mean of its divisors is an integer number (2795650).

Almost surely, 2^21150211 is an apocalyptic number.

21150211 is a deficient number, since it is larger than the sum of its proper divisors (1214989).

21150211 is a wasteful number, since it uses less digits than its factorization.

21150211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 21150211 is about 4598.9358551735. The cubic root of 21150211 is about 276.5486661513.

Adding to 21150211 its reverse (11205112), we get a palindrome (32355323).

The spelling of 21150211 in words is "twenty-one million, one hundred fifty thousand, two hundred eleven".