121213321021 has 16 divisors (see below), whose sum is σ = 130740064000. Its totient is φ = 111715692480.

The previous prime is 121213320961. The next prime is 121213321067. The reversal of 121213321021 is 120123312121.

It is a cyclic number.

It is not a de Polignac number, because 121213321021 - 2⁹ = 121213320509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121213321021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213321921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33547411 + ... + 33551023.

It is an arithmetic number, because the mean of its divisors is an integer number (8171254000).

Almost surely, 2^121213321021 is an apocalyptic number.

It is an amenable number.

121213321021 is a deficient number, since it is larger than the sum of its proper divisors (9526742979).

121213321021 is a wasteful number, since it uses less digits than its factorization.

121213321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6916.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121213321021 its reverse (120123312121), we get a palindrome (241336633142).

The spelling of 121213321021 in words is "one hundred twenty-one billion, two hundred thirteen million, three hundred twenty-one thousand, twenty-one".