121209942 has 16 divisors (see below), whose sum is σ = 277051392. Its totient is φ = 34631400.

The previous prime is 121209941. The next prime is 121209953. The reversal of 121209942 is 249902121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121209941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442934 + ... + 1443017.

It is an arithmetic number, because the mean of its divisors is an integer number (17315712).

Almost surely, 2^121209942 is an apocalyptic number.

121209942 is an abundant number, since it is smaller than the sum of its proper divisors (155841450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121209942 is a wasteful number, since it uses less digits than its factorization.

121209942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885963.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 121209942 is about 11009.5386824335. The cubic root of 121209942 is about 494.8946373033.

The spelling of 121209942 in words is "one hundred twenty-one million, two hundred nine thousand, nine hundred forty-two".