189819874021 has 8 divisors (see below), whose sum is σ = 193716914040. Its totient is φ = 185934520512.

The previous prime is 189819874009. The next prime is 189819874037. The reversal of 189819874021 is 120478918981.

It can be written as a sum of positive squares in 4 ways, for example, as 33764062500 + 156055811521 = 183750^2 + 395039^2 .

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 189819874021 - 2¹⁷ = 189819742949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189819874001) 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, 2888806 + ... + 2953783.

It is an arithmetic number, because the mean of its divisors is an integer number (24214614255).

Almost surely, 2^189819874021 is an apocalyptic number.

It is an amenable number.

189819874021 is a deficient number, since it is larger than the sum of its proper divisors (3897040019).

189819874021 is an equidigital number, since it uses as much as digits as its factorization.

189819874021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5843255.

The product of its (nonzero) digits is 2322432, while the sum is 58.

The spelling of 189819874021 in words is "one hundred eighty-nine billion, eight hundred nineteen million, eight hundred seventy-four thousand, twenty-one".