821093716 has 12 divisors (see below), whose sum is σ = 1471960980. Its totient is φ = 400533440.

The previous prime is 821093641. The next prime is 821093723. The reversal of 821093716 is 617390128.

It can be written as a sum of positive squares in 2 ways, for example, as 482680900 + 338412816 = 21970^2 + 18396^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2503171 + ... + 2503498.

It is an arithmetic number, because the mean of its divisors is an integer number (122663415).

Almost surely, 2^821093716 is an apocalyptic number.

It is an amenable number.

821093716 is a deficient number, since it is larger than the sum of its proper divisors (650867264).

821093716 is a wasteful number, since it uses less digits than its factorization.

821093716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006714 (or 5006712 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 821093716 is about 28654.7328725989. The cubic root of 821093716 is about 936.4061186609.

It can be divided in two parts, 8210 and 93716, that added together give a triangular number (101926 = T₄₅₁).

The spelling of 821093716 in words is "eight hundred twenty-one million, ninety-three thousand, seven hundred sixteen".