90821931203365 has 4 divisors (see below), whose sum is σ = 108986317444044. Its totient is φ = 72657544962688.

The previous prime is 90821931203287. The next prime is 90821931203441. The reversal of 90821931203365 is 56330213912809.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16485150956481 + 74336780246884 = 4060191^2 + 8621878^2 .

It is a cyclic number.

It is not a de Polignac number, because 90821931203365 - 2³⁹ = 90272175389477 is a prime.

It is a Duffinian number.

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, 9082193120332 + ... + 9082193120341.

It is an arithmetic number, because the mean of its divisors is an integer number (27246579361011).

Almost surely, 2^{90821931203365} is an apocalyptic number.

It is an amenable number.

90821931203365 is a deficient number, since it is larger than the sum of its proper divisors (18164386240679).

90821931203365 is a wasteful number, since it uses less digits than its factorization.

90821931203365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18164386240678.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 90821931203365 in words is "ninety trillion, eight hundred twenty-one billion, nine hundred thirty-one million, two hundred three thousand, three hundred sixty-five".