121455 has 12 divisors (see below), whose sum is σ = 210600. Its totient is φ = 64752.

The previous prime is 121453. The next prime is 121469. The reversal of 121455 is 554121.

It is not a de Polignac number, because 121455 - 2¹ = 121453 is a prime.

121455 is a lucky number.

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 121455.

It is not an unprimeable number, because it can be changed into a prime (121453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1305 + ... + 1394.

It is an arithmetic number, because the mean of its divisors is an integer number (17550).

2¹²¹⁴⁵⁵ is an apocalyptic number.

121455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121455 is a deficient number, since it is larger than the sum of its proper divisors (89145).

121455 is a wasteful number, since it uses less digits than its factorization.

121455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710 (or 2707 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 121455 is about 348.5039454583. The cubic root of 121455 is about 49.5227932983.

Adding to 121455 its reverse (554121), we get a palindrome (675576).

It can be divided in two parts, 121 and 455, that multiplied together give a palindrome (55055).

The spelling of 121455 in words is "one hundred twenty-one thousand, four hundred fifty-five".