121213343541 has 16 divisors (see below), whose sum is σ = 162672851264. Its totient is φ = 80281528704.

The previous prime is 121213343539. The next prime is 121213343551. The reversal of 121213343541 is 145343312121.

It is not a de Polignac number, because 121213343541 - 2¹ = 121213343539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121213343499 and 121213343508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213343551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3689001 + ... + 3721713.

It is an arithmetic number, because the mean of its divisors is an integer number (10167053204).

Almost surely, 2^121213343541 is an apocalyptic number.

It is an amenable number.

121213343541 is a deficient number, since it is larger than the sum of its proper divisors (41459507723).

121213343541 is a wasteful number, since it uses less digits than its factorization.

121213343541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40740.

The product of its digits is 8640, while the sum is 30.

Adding to 121213343541 its reverse (145343312121), we get a palindrome (266556655662).

The spelling of 121213343541 in words is "one hundred twenty-one billion, two hundred thirteen million, three hundred forty-three thousand, five hundred forty-one".