121869 has 12 divisors (see below), whose sum is σ = 192192. Its totient is φ = 73800.

The previous prime is 121867. The next prime is 121883. The reversal of 121869 is 968121.

It is not a de Polignac number, because 121869 - 2¹ = 121867 is a prime.

It is a super-2 number, since 2×121869² = 29704106322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121867) 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, 517 + ... + 714.

It is an arithmetic number, because the mean of its divisors is an integer number (16016).

2¹²¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

121869 is a deficient number, since it is larger than the sum of its proper divisors (70323).

121869 is a wasteful number, since it uses less digits than its factorization.

121869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1245 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 121869 is about 349.0974076100. The cubic root of 121869 is about 49.5789984362.

It can be divided in two parts, 121 and 869, that added together give a triangular number (990 = T₄₄).

The spelling of 121869 in words is "one hundred twenty-one thousand, eight hundred sixty-nine".