121554 has 16 divisors (see below), whose sum is σ = 270240. Its totient is φ = 40500.

The previous prime is 121553. The next prime is 121559. The reversal of 121554 is 455121.

121554 is nontrivially palindromic in base 13.

121554 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (18).

121554 is an undulating number in base 13.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072 + ... + 1179.

It is an arithmetic number, because the mean of its divisors is an integer number (16890).

2¹²¹⁵⁵⁴ is an apocalyptic number.

121554 is an abundant number, since it is smaller than the sum of its proper divisors (148686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121554 is a wasteful number, since it uses less digits than its factorization.

121554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262 (or 2256 counting only the distinct ones).

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

The square root of 121554 is about 348.6459522209. The cubic root of 121554 is about 49.5362452627.

Adding to 121554 its reverse (455121), we get a palindrome (576675).

The spelling of 121554 in words is "one hundred twenty-one thousand, five hundred fifty-four".