121199969 has 4 divisors (see below), whose sum is σ = 132218160. Its totient is φ = 110181780.

The previous prime is 121199941. The next prime is 121199971. The reversal of 121199969 is 969991121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121199969 is a prime.

It is a super-2 number, since 2×121199969² = 29378864971201922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121199909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5509079 + ... + 5509100.

It is an arithmetic number, because the mean of its divisors is an integer number (33054540).

Almost surely, 2^121199969 is an apocalyptic number.

It is an amenable number.

121199969 is a deficient number, since it is larger than the sum of its proper divisors (11018191).

121199969 is a wasteful number, since it uses less digits than its factorization.

121199969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11018190.

The product of its digits is 78732, while the sum is 47.

The square root of 121199969 is about 11009.0857476904. The cubic root of 121199969 is about 494.8810638304.

The spelling of 121199969 in words is "one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred sixty-nine".