13020321625642 has 4 divisors (see below), whose sum is σ = 19530482438466. Its totient is φ = 6510160812820.

The previous prime is 13020321625637. The next prime is 13020321625643. The reversal of 13020321625642 is 24652612302031.

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

It can be written as a sum of positive squares in only one way, i.e., 9786442332241 + 3233879293401 = 3128329^2 + 1798299^2 .

It is not an unprimeable number, because it can be changed into a prime (13020321625643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3255080406409 + ... + 3255080406412.

Almost surely, 2^{13020321625642} is an apocalyptic number.

13020321625642 is a deficient number, since it is larger than the sum of its proper divisors (6510160812824).

13020321625642 is an equidigital number, since it uses as much as digits as its factorization.

13020321625642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6510160812823.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 13020321625642 its reverse (24652612302031), we get a palindrome (37672933927673).

The spelling of 13020321625642 in words is "thirteen trillion, twenty billion, three hundred twenty-one million, six hundred twenty-five thousand, six hundred forty-two".