121221212041242 has 128 divisors (see below), whose sum is σ = 281553447813120. Its totient is φ = 38586904297920.

The previous prime is 121221212041213. The next prime is 121221212041277. The reversal of 121221212041242 is 242140212122121.

121221212041242 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 212 + 1 + 204 + 1 + 242 = 666.

It is a super-3 number, since 3×121221212041242³ (a number of 43 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7516654183 + ... + 7516670309.

It is an arithmetic number, because the mean of its divisors is an integer number (2199636311040).

Almost surely, 2^{121221212041242} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121221212041242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140776723906560).

121221212041242 is an abundant number, since it is smaller than the sum of its proper divisors (160332235771878).

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

121221212041242 is a wasteful number, since it uses less digits than its factorization.

121221212041242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25705 (or 25699 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

Adding to 121221212041242 its reverse (242140212122121), we get a palindrome (363361424163363).

The spelling of 121221212041242 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, forty-one thousand, two hundred forty-two".