121131311230021 has 4 divisors (see below), whose sum is σ = 124405130452492. Its totient is φ = 117857492007552.

The previous prime is 121131311229941. The next prime is 121131311230063. The reversal of 121131311230021 is 120032113131121.

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 106634826099396 + 14496485130625 = 10326414^2 + 3807425^2 .

It is a cyclic number.

It is not a de Polignac number, because 121131311230021 - 2¹⁷ = 121131311098949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121131311229974 and 121131311230001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131311230421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1636909611180 + ... + 1636909611253.

It is an arithmetic number, because the mean of its divisors is an integer number (31101282613123).

Almost surely, 2^{121131311230021} is an apocalyptic number.

It is an amenable number.

121131311230021 is a deficient number, since it is larger than the sum of its proper divisors (3273819222471).

121131311230021 is an equidigital number, since it uses as much as digits as its factorization.

121131311230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273819222470.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 121131311230021 its reverse (120032113131121), we get a palindrome (241163424361142).

The spelling of 121131311230021 in words is "one hundred twenty-one trillion, one hundred thirty-one billion, three hundred eleven million, two hundred thirty thousand, twenty-one".