821494071 has 12 divisors (see below), whose sum is σ = 1187291248. Its totient is φ = 547344864.

The previous prime is 821494033. The next prime is 821494097. The reversal of 821494071 is 170494128.

821494071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 821494071 - 2⁶ = 821494007 is a prime.

It is a super-3 number, since 3×821494071³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821494171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9550 + ... + 41643.

Almost surely, 2^821494071 is an apocalyptic number.

821494071 is a deficient number, since it is larger than the sum of its proper divisors (365797177).

821494071 is a wasteful number, since it uses less digits than its factorization.

821494071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52982 (or 52979 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 821494071 is about 28661.7178654735. The cubic root of 821494071 is about 936.5582872256.

The spelling of 821494071 in words is "eight hundred twenty-one million, four hundred ninety-four thousand, seventy-one".