421121 has 2 divisors, whose sum is σ = 421122. Its totient is φ = 421120.

The previous prime is 421103. The next prime is 421123. The reversal of 421121 is 121124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261121 + 160000 = 511^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 421121 - 2¹⁰ = 420097 is a prime.

Together with 421123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210560 + 210561.

It is an arithmetic number, because the mean of its divisors is an integer number (210561).

2⁴²¹¹²¹ is an apocalyptic number.

It is an amenable number.

421121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421121 is an equidigital number, since it uses as much as digits as its factorization.

421121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 11.

The square root of 421121 is about 648.9383637912. The cubic root of 421121 is about 74.9552918729.

Adding to 421121 its reverse (121124), we get a palindrome (542245).

The spelling of 421121 in words is "four hundred twenty-one thousand, one hundred twenty-one", and thus it is an iban number.