121724 has 6 divisors (see below), whose sum is σ = 213024. Its totient is φ = 60860.

The previous prime is 121721. The next prime is 121727. The reversal of 121724 is 427121.

It is an interprime number because it is at equal distance from previous prime (121721) and next prime (121727).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15212 + ... + 15219.

It is an arithmetic number, because the mean of its divisors is an integer number (35504).

2¹²¹⁷²⁴ is an apocalyptic number.

It is an amenable number.

121724 is a deficient number, since it is larger than the sum of its proper divisors (91300).

121724 is a wasteful number, since it uses less digits than its factorization.

121724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30435 (or 30433 counting only the distinct ones).

The product of its digits is 112, while the sum is 17.

The square root of 121724 is about 348.8896673735. The cubic root of 121724 is about 49.5593275661.

Adding to 121724 its reverse (427121), we get a palindrome (548845).

The spelling of 121724 in words is "one hundred twenty-one thousand, seven hundred twenty-four", and thus it is an iban number.