159421 has 2 divisors, whose sum is σ = 159422. Its totient is φ = 159420.

The previous prime is 159407. The next prime is 159431. The reversal of 159421 is 124951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151321 + 8100 = 389^2 + 90^2 .

It is an emirp because it is prime and its reverse (124951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159421 - 2⁵ = 159389 is a prime.

159421 is a lucky number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 159392 and 159401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79710 + 79711.

It is an arithmetic number, because the mean of its divisors is an integer number (79711).

2¹⁵⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

159421 is a deficient number, since it is larger than the sum of its proper divisors (1).

159421 is an equidigital number, since it uses as much as digits as its factorization.

159421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 159421 is about 399.2755940450. The cubic root of 159421 is about 54.2227878560. Note that the first 3 decimals are identical.

The spelling of 159421 in words is "one hundred fifty-nine thousand, four hundred twenty-one".