13121122012021 has 8 divisors (see below), whose sum is σ = 13280894860184. Its totient is φ = 12961849236480.

The previous prime is 13121122012003. The next prime is 13121122012069. The reversal of 13121122012021 is 12021022112131.

It can be written as a sum of positive squares in 4 ways, for example, as 3199944967921 + 9921177044100 = 1788839^2 + 3149790^2 .

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 13121122012021 - 2⁹ = 13121122011509 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 13121122012021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121122012001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124965360 + ... + 125070313.

It is an arithmetic number, because the mean of its divisors is an integer number (1660111857523).

Almost surely, 2^{13121122012021} is an apocalyptic number.

It is an amenable number.

13121122012021 is a deficient number, since it is larger than the sum of its proper divisors (159772848163).

13121122012021 is an equidigital number, since it uses as much as digits as its factorization.

13121122012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250036311.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 13121122012021 its reverse (12021022112131), we get a palindrome (25142144124152).

The spelling of 13121122012021 in words is "thirteen trillion, one hundred twenty-one billion, one hundred twenty-two million, twelve thousand, twenty-one".