121213404442 has 8 divisors (see below), whose sum is σ = 195806268756. Its totient is φ = 55944648192.

The previous prime is 121213404439. The next prime is 121213404461. The reversal of 121213404442 is 244404312121.

It can be written as a sum of positive squares in 2 ways, for example, as 100350201961 + 20863202481 = 316781^2 + 144441^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 121213404442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2331026983 + ... + 2331027034.

Almost surely, 2^121213404442 is an apocalyptic number.

121213404442 is a deficient number, since it is larger than the sum of its proper divisors (74592864314).

121213404442 is a wasteful number, since it uses less digits than its factorization.

121213404442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662054032.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 121213404442 its reverse (244404312121), we get a palindrome (365617716563).

The spelling of 121213404442 in words is "one hundred twenty-one billion, two hundred thirteen million, four hundred four thousand, four hundred forty-two".