121242134021 has 8 divisors (see below), whose sum is σ = 124530683424. Its totient is φ = 117954202320.

The previous prime is 121242133891. The next prime is 121242134033. The reversal of 121242134021 is 120431242121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121242134021 is a prime.

It is a super-2 number, since 2×121242134021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242134081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258206 + ... + 556016.

It is an arithmetic number, because the mean of its divisors is an integer number (15566335428).

Almost surely, 2^121242134021 is an apocalyptic number.

It is an amenable number.

121242134021 is a deficient number, since it is larger than the sum of its proper divisors (3288549403).

121242134021 is a wasteful number, since it uses less digits than its factorization.

121242134021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308851.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 121242134021 its reverse (120431242121), we get a palindrome (241673376142).

The spelling of 121242134021 in words is "one hundred twenty-one billion, two hundred forty-two million, one hundred thirty-four thousand, twenty-one".