121211406 has 24 divisors (see below), whose sum is σ = 262973880. Its totient is φ = 40350096.

The previous prime is 121211399. The next prime is 121211437. The reversal of 121211406 is 604112121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 10861 + ... + 18983.

It is an arithmetic number, because the mean of its divisors is an integer number (10957245).

Almost surely, 2^121211406 is an apocalyptic number.

121211406 is an abundant number, since it is smaller than the sum of its proper divisors (141762474).

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

121211406 is a wasteful number, since it uses less digits than its factorization.

121211406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8960 (or 8957 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 121211406 is about 11009.6051700322. The cubic root of 121211406 is about 494.8966297769.

Adding to 121211406 its reverse (604112121), we get a palindrome (725323527).

The spelling of 121211406 in words is "one hundred twenty-one million, two hundred eleven thousand, four hundred six".