121401 has 24 divisors (see below), whose sum is σ = 209664. Its totient is φ = 66240.

The previous prime is 121379. The next prime is 121403. The reversal of 121401 is 104121.

121401 = T₈ + T₉ + ... + T₈₉.

It is a happy number.

It is not a de Polignac number, because 121401 - 2⁵ = 121369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121401.

It is not an unprimeable number, because it can be changed into a prime (121403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2560 + ... + 2606.

It is an arithmetic number, because the mean of its divisors is an integer number (8736).

2¹²¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

121401 is a deficient number, since it is larger than the sum of its proper divisors (88263).

121401 is a wasteful number, since it uses less digits than its factorization.

121401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121401 is about 348.4264628297. The cubic root of 121401 is about 49.5154527819.

Adding to 121401 its reverse (104121), we get a palindrome (225522).

The spelling of 121401 in words is "one hundred twenty-one thousand, four hundred one", and thus it is an iban number.