89191922821 has 8 divisors (see below), whose sum is σ = 90069318360. Its totient is φ = 88317808128.

The previous prime is 89191922819. The next prime is 89191922881. The reversal of 89191922821 is 12822919198.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26611396900 + 62580525921 = 163130^2 + 250161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 89191922821 - 2¹ = 89191922819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89191922881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765556 + ... + 874333.

It is an arithmetic number, because the mean of its divisors is an integer number (11258664795).

Almost surely, 2^89191922821 is an apocalyptic number.

It is an amenable number.

89191922821 is a deficient number, since it is larger than the sum of its proper divisors (877395539).

89191922821 is a wasteful number, since it uses less digits than its factorization.

89191922821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640423.

The product of its digits is 373248, while the sum is 52.

The spelling of 89191922821 in words is "eighty-nine billion, one hundred ninety-one million, nine hundred twenty-two thousand, eight hundred twenty-one".