121670 has 16 divisors (see below), whose sum is σ = 228960. Its totient is φ = 46552.

The previous prime is 121661. The next prime is 121687. The reversal of 121670 is 76121.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

121670 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5279 + ... + 5301.

It is an arithmetic number, because the mean of its divisors is an integer number (14310).

2¹²¹⁶⁷⁰ is an apocalyptic number.

121670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121670 is a deficient number, since it is larger than the sum of its proper divisors (107290).

121670 is an frugal number, since it uses more digits than its factorization.

121670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 121670 is about 348.8122704264. The cubic root of 121670 is about 49.5519978707.

Adding to 121670 its reverse (76121), we get a palindrome (197791).

The spelling of 121670 in words is "one hundred twenty-one thousand, six hundred seventy".