121742868 has 72 divisors (see below), whose sum is σ = 310268448. Its totient is φ = 37135488.

The previous prime is 121742867. The next prime is 121742897. The reversal of 121742868 is 868247121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121742867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350671 + ... + 351017.

It is an arithmetic number, because the mean of its divisors is an integer number (4309284).

Almost surely, 2^121742868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121742868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155134224).

121742868 is an abundant number, since it is smaller than the sum of its proper divisors (188525580).

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

121742868 is a wasteful number, since it uses less digits than its factorization.

121742868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 538 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 121742868 is about 11033.7150588548. The cubic root of 121742868 is about 495.6188810496.

Adding to 121742868 its reverse (868247121), we get a palindrome (989989989).

The spelling of 121742868 in words is "one hundred twenty-one million, seven hundred forty-two thousand, eight hundred sixty-eight".