121916 has 12 divisors (see below), whose sum is σ = 220920. Its totient is φ = 58800.

The previous prime is 121909. The next prime is 121921. The reversal of 121916 is 619121.

It is a super-2 number, since 2×121916² = 29727022112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

121916 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 3 ways as a sum of consecutive naturals, for example, 410 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (18410).

2¹²¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

121916 is a deficient number, since it is larger than the sum of its proper divisors (99004).

121916 is a wasteful number, since it uses less digits than its factorization.

121916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084 (or 1082 counting only the distinct ones).

The product of its digits is 108, while the sum is 20.

The square root of 121916 is about 349.1647175761. The cubic root of 121916 is about 49.5853711628.

The spelling of 121916 in words is "one hundred twenty-one thousand, nine hundred sixteen".