121212056 has 16 divisors (see below), whose sum is σ = 259740240. Its totient is φ = 51948000.

The previous prime is 121212017. The next prime is 121212071. The reversal of 121212056 is 650212121.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1082195 + ... + 1082306.

It is an arithmetic number, because the mean of its divisors is an integer number (16233765).

Almost surely, 2^121212056 is an apocalyptic number.

It is an amenable number.

121212056 is an abundant number, since it is smaller than the sum of its proper divisors (138528184).

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

121212056 is a wasteful number, since it uses less digits than its factorization.

121212056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164514 (or 2164510 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 121212056 is about 11009.6346896707. The cubic root of 121212056 is about 494.8975144083.

Adding to 121212056 its reverse (650212121), we get a palindrome (771424177).

The spelling of 121212056 in words is "one hundred twenty-one million, two hundred twelve thousand, fifty-six".