21211019 has 8 divisors (see below), whose sum is σ = 22509648. Its totient is φ = 19918080.

The previous prime is 21211013. The next prime is 21211033. The reversal of 21211019 is 91011212.

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

It is a cyclic number.

It is not a de Polignac number, because 21211019 - 2¹² = 21206923 is a prime.

It is a super-2 number, since 2×21211019² = 899814654036722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210988 and 21211006.

It is not an unprimeable number, because it can be changed into a prime (21211013) 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, 8159 + ... + 10439.

It is an arithmetic number, because the mean of its divisors is an integer number (2813706).

Almost surely, 2^21211019 is an apocalyptic number.

21211019 is a deficient number, since it is larger than the sum of its proper divisors (1298629).

21211019 is a wasteful number, since it uses less digits than its factorization.

21211019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2845.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21211019 is about 4605.5422047789. The cubic root of 21211019 is about 276.8134433521.

The spelling of 21211019 in words is "twenty-one million, two hundred eleven thousand, nineteen".