121641 has 8 divisors (see below), whose sum is σ = 174720. Its totient is φ = 74832.

The previous prime is 121637. The next prime is 121661. The reversal of 121641 is 146121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121641 - 2² = 121637 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 121641.

It is not an unprimeable number, because it can be changed into a prime (121621) 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, 1521 + ... + 1598.

It is an arithmetic number, because the mean of its divisors is an integer number (21840).

2¹²¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

121641 is a deficient number, since it is larger than the sum of its proper divisors (53079).

121641 is a wasteful number, since it uses less digits than its factorization.

121641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135.

The product of its digits is 48, while the sum is 15.

The square root of 121641 is about 348.7706983105. The cubic root of 121641 is about 49.5480606577.

Adding to 121641 its reverse (146121), we get a palindrome (267762).

It can be divided in two parts, 12 and 1641, that added together give a triangular number (1653 = T₅₇).

The spelling of 121641 in words is "one hundred twenty-one thousand, six hundred forty-one".