121787213 has 8 divisors (see below), whose sum is σ = 123244800. Its totient is φ = 120338208.

The previous prime is 121787203. The next prime is 121787221. The reversal of 121787213 is 312787121.

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 121787213 - 2¹² = 121783117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121787213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121787203) 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, 29033 + ... + 32961.

It is an arithmetic number, because the mean of its divisors is an integer number (15405600).

Almost surely, 2^121787213 is an apocalyptic number.

It is an amenable number.

121787213 is a deficient number, since it is larger than the sum of its proper divisors (1457587).

121787213 is a wasteful number, since it uses less digits than its factorization.

121787213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291.

The product of its digits is 4704, while the sum is 32.

The square root of 121787213 is about 11035.7243985159. The cubic root of 121787213 is about 495.6790503547.

It can be divided in two parts, 12178 and 7213, that added together give a palindrome (19391).

The spelling of 121787213 in words is "one hundred twenty-one million, seven hundred eighty-seven thousand, two hundred thirteen".