189838182021 has 4 divisors (see below), whose sum is σ = 253117576032. Its totient is φ = 126558788012.

The previous prime is 189838181947. The next prime is 189838182029. The reversal of 189838182021 is 120281838981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189838182021 - 2¹⁰ = 189838180997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189838182029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31639697001 + ... + 31639697006.

It is an arithmetic number, because the mean of its divisors is an integer number (63279394008).

Almost surely, 2^189838182021 is an apocalyptic number.

It is an amenable number.

189838182021 is a deficient number, since it is larger than the sum of its proper divisors (63279394011).

189838182021 is an equidigital number, since it uses as much as digits as its factorization.

189838182021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63279394010.

The product of its (nonzero) digits is 442368, while the sum is 51.

The spelling of 189838182021 in words is "one hundred eighty-nine billion, eight hundred thirty-eight million, one hundred eighty-two thousand, twenty-one".