20213120323129 has 4 divisors (see below), whose sum is σ = 20221504033680. Its totient is φ = 20204736612580.

The previous prime is 20213120323063. The next prime is 20213120323141. The reversal of 20213120323129 is 92132302131202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20213120323129 - 2¹¹ = 20213120321081 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 20213120323129.

It is not an unprimeable number, because it can be changed into a prime (20213120333129) 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, 4191851659 + ... + 4191856480.

It is an arithmetic number, because the mean of its divisors is an integer number (5055376008420).

Almost surely, 2^{20213120323129} is an apocalyptic number.

It is an amenable number.

20213120323129 is a deficient number, since it is larger than the sum of its proper divisors (8383710551).

20213120323129 is an equidigital number, since it uses as much as digits as its factorization.

20213120323129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8383710550.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 20213120323129 in words is "twenty trillion, two hundred thirteen billion, one hundred twenty million, three hundred twenty-three thousand, one hundred twenty-nine".