189359451937021 has 8 divisors (see below), whose sum is σ = 200500731355320. Its totient is φ = 178218448977408.

The previous prime is 189359451937009. The next prime is 189359451937049. The reversal of 189359451937021 is 120739154953981.

It can be written as a sum of positive squares in 4 ways, for example, as 17787728002500 + 171571723934521 = 4217550^2 + 13098539^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189359451937021 is a prime.

It is a super-2 number, since 2×189359451937021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189359451937421) 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, 67703656 + ... + 70445041.

It is an arithmetic number, because the mean of its divisors is an integer number (25062591419415).

Almost surely, 2^{189359451937021} is an apocalyptic number.

It is an amenable number.

189359451937021 is a deficient number, since it is larger than the sum of its proper divisors (11141279418299).

189359451937021 is a wasteful number, since it uses less digits than its factorization.

189359451937021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138229343.

The product of its (nonzero) digits is 73483200, while the sum is 67.

The spelling of 189359451937021 in words is "one hundred eighty-nine trillion, three hundred fifty-nine billion, four hundred fifty-one million, nine hundred thirty-seven thousand, twenty-one".