121421 has 2 divisors, whose sum is σ = 121422. Its totient is φ = 121420.

The previous prime is 121403. The next prime is 121439. The reversal of 121421 is 124121.

It is a balanced prime because it is at equal distance from previous prime (121403) and next prime (121439).

It can be written as a sum of positive squares in only one way, i.e., 75625 + 45796 = 275^2 + 214^2 .

It is an emirp because it is prime and its reverse (124121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121421 - 2⁶ = 121357 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121421.

It is not a weakly prime, because it can be changed into another prime (121441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60710 + 60711.

It is an arithmetic number, because the mean of its divisors is an integer number (60711).

2¹²¹⁴²¹ is an apocalyptic number.

It is an amenable number.

121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121421 is an equidigital number, since it uses as much as digits as its factorization.

121421 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 121421 is about 348.4551621084. The cubic root of 121421 is about 49.5181717454.

Adding to 121421 its reverse (124121), we get a palindrome (245542).

The spelling of 121421 in words is "one hundred twenty-one thousand, four hundred twenty-one", and thus it is an iban number.