13121322220001 has 4 divisors (see below), whose sum is σ = 13134275155092. Its totient is φ = 13108369284912.

The previous prime is 13121322219997. The next prime is 13121322220009. The reversal of 13121322220001 is 10002222312131.

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 935630598400 + 12185691621601 = 967280^2 + 3490801^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121322220001 - 2² = 13121322219997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121322220009) 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, 6476466026 + ... + 6476468051.

It is an arithmetic number, because the mean of its divisors is an integer number (3283568788773).

Almost surely, 2^{13121322220001} is an apocalyptic number.

It is an amenable number.

13121322220001 is a deficient number, since it is larger than the sum of its proper divisors (12952935091).

13121322220001 is a wasteful number, since it uses less digits than its factorization.

13121322220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12952935090.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 13121322220001 its reverse (10002222312131), we get a palindrome (23123544532132).

The spelling of 13121322220001 in words is "thirteen trillion, one hundred twenty-one billion, three hundred twenty-two million, two hundred twenty thousand, one".