121320011311021 has 4 divisors (see below), whose sum is σ = 122570733077212. Its totient is φ = 120069289544832.

The previous prime is 121320011311007. The next prime is 121320011311069. The reversal of 121320011311021 is 120113110023121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42984873001225 + 78335138309796 = 6556285^2 + 8850714^2 .

It is a cyclic number.

It is not a de Polignac number, because 121320011311021 - 2¹⁷ = 121320011179949 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 121320011311021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121320011311621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625360882950 + ... + 625360883143.

It is an arithmetic number, because the mean of its divisors is an integer number (30642683269303).

Almost surely, 2^{121320011311021} is an apocalyptic number.

It is an amenable number.

121320011311021 is a deficient number, since it is larger than the sum of its proper divisors (1250721766191).

121320011311021 is an equidigital number, since it uses as much as digits as its factorization.

121320011311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250721766190.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 121320011311021 its reverse (120113110023121), we get a palindrome (241433121334142).

The spelling of 121320011311021 in words is "one hundred twenty-one trillion, three hundred twenty billion, eleven million, three hundred eleven thousand, twenty-one".