1212210121 has 8 divisors (see below), whose sum is σ = 1255222080. Its totient is φ = 1169278992.

The previous prime is 1212210091. The next prime is 1212210137. The reversal of 1212210121 is 1210122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212210121 - 2¹¹ = 1212208073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212210161) 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, 11166 + ... + 50488.

It is an arithmetic number, because the mean of its divisors is an integer number (156902760).

Almost surely, 2^1212210121 is an apocalyptic number.

It is an amenable number.

1212210121 is a deficient number, since it is larger than the sum of its proper divisors (43011959).

1212210121 is a wasteful number, since it uses less digits than its factorization.

1212210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40415.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1212210121 is about 34816.8080242862. The cubic root of 1212210121 is about 1066.2506327525.

Adding to 1212210121 its reverse (1210122121), we get a palindrome (2422332242).

The spelling of 1212210121 in words is "one billion, two hundred twelve million, two hundred ten thousand, one hundred twenty-one".