821090419 has 4 divisors (see below), whose sum is σ = 821164696. Its totient is φ = 821016144.

The previous prime is 821090401. The next prime is 821090437. The reversal of 821090419 is 914090128.

821090419 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (821090401) and next prime (821090437).

It is a cyclic number.

It is not a de Polignac number, because 821090419 - 2¹¹ = 821088371 is a prime.

It is a super-2 number, since 2×821090419² = 1348378952347191122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821090519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16869 + ... + 43894.

It is an arithmetic number, because the mean of its divisors is an integer number (205291174).

Almost surely, 2^821090419 is an apocalyptic number.

821090419 is a deficient number, since it is larger than the sum of its proper divisors (74277).

821090419 is a wasteful number, since it uses less digits than its factorization.

821090419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74276.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 821090419 is about 28654.6753427778. The cubic root of 821090419 is about 936.4048653183.

The spelling of 821090419 in words is "eight hundred twenty-one million, ninety thousand, four hundred nineteen".