121321213021 has 8 divisors (see below), whose sum is σ = 122194791000. Its totient is φ = 120448426560.

The previous prime is 121321213001. The next prime is 121321213049. The reversal of 121321213021 is 120312123121.

It can be written as a sum of positive squares in 4 ways, for example, as 10052268121 + 111268944900 = 100261^2 + 333570^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121321213021 - 2³¹ = 119173729373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121321213021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321213001) 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, 111511 + ... + 505051.

It is an arithmetic number, because the mean of its divisors is an integer number (15274348875).

Almost surely, 2^121321213021 is an apocalyptic number.

It is an amenable number.

121321213021 is a deficient number, since it is larger than the sum of its proper divisors (873577979).

121321213021 is a wasteful number, since it uses less digits than its factorization.

121321213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395759.

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

Adding to 121321213021 its reverse (120312123121), we get a palindrome (241633336142).

The spelling of 121321213021 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred thirteen thousand, twenty-one".