21050619 has 4 divisors (see below), whose sum is σ = 28067496. Its totient is φ = 14033744.

The previous prime is 21050611. The next prime is 21050629. The reversal of 21050619 is 91605012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21050619 - 2³ = 21050611 is a prime.

It is a super-2 number, since 2×21050619² = 886257120566322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21050611) 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 3 ways as a sum of consecutive naturals, for example, 3508434 + ... + 3508439.

It is an arithmetic number, because the mean of its divisors is an integer number (7016874).

Almost surely, 2^21050619 is an apocalyptic number.

21050619 is a deficient number, since it is larger than the sum of its proper divisors (7016877).

21050619 is an equidigital number, since it uses as much as digits as its factorization.

21050619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016876.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 21050619 is about 4588.0953564633. The cubic root of 21050619 is about 276.1139127560.

The spelling of 21050619 in words is "twenty-one million, fifty thousand, six hundred nineteen".