177421 has 2 divisors, whose sum is σ = 177422. Its totient is φ = 177420.

The previous prime is 177409. The next prime is 177427. The reversal of 177421 is 124771.

177421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114921 + 62500 = 339^2 + 250^2 .

It is an emirp because it is prime and its reverse (124771) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 177421 - 2¹⁷ = 46349 is a prime.

It is a super-2 number, since 2×177421² = 62956422482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 177392 and 177401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (177427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 88710 + 88711.

It is an arithmetic number, because the mean of its divisors is an integer number (88711).

2¹⁷⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

177421 is a deficient number, since it is larger than the sum of its proper divisors (1).

177421 is an equidigital number, since it uses as much as digits as its factorization.

177421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 392, while the sum is 22.

The square root of 177421 is about 421.2137224735. The cubic root of 177421 is about 56.1912044087.

Subtracting from 177421 its reverse (124771), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 177421 in words is "one hundred seventy-seven thousand, four hundred twenty-one", and thus it is an iban number.