20013721234601 has 4 divisors (see below), whose sum is σ = 20014081035732. Its totient is φ = 20013361433472.

The previous prime is 20013721234571. The next prime is 20013721234613. The reversal of 20013721234601 is 10643212731002.

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 9710577792400 + 10303143442201 = 3116180^2 + 3209851^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013721234601 - 2¹⁴ = 20013721218217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013721234621) 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, 179817116 + ... + 179928381.

It is an arithmetic number, because the mean of its divisors is an integer number (5003520258933).

Almost surely, 2^{20013721234601} is an apocalyptic number.

It is an amenable number.

20013721234601 is a deficient number, since it is larger than the sum of its proper divisors (359801131).

20013721234601 is an equidigital number, since it uses as much as digits as its factorization.

20013721234601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359801130.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 20013721234601 its reverse (10643212731002), we get a palindrome (30656933965603).

The spelling of 20013721234601 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred thirty-four thousand, six hundred one".