121995 has 12 divisors (see below), whose sum is σ = 211536. Its totient is φ = 65040.

The previous prime is 121993. The next prime is 121997. The reversal of 121995 is 599121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121993) and next prime (121997).

It is not a de Polignac number, because 121995 - 2¹ = 121993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121993) 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, 1311 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (17628).

2¹²¹⁹⁹⁵ is an apocalyptic number.

121995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121995 is a deficient number, since it is larger than the sum of its proper divisors (89541).

121995 is a wasteful number, since it uses less digits than its factorization.

121995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722 (or 2719 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 121995 is about 349.2778263789. The cubic root of 121995 is about 49.5960790778.

The spelling of 121995 in words is "one hundred twenty-one thousand, nine hundred ninety-five".