20104221013 has 4 divisors (see below), whose sum is σ = 20104893900. Its totient is φ = 20103548128.

The previous prime is 20104220999. The next prime is 20104221047. The reversal of 20104221013 is 31012240102.

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 14309662129 + 5794558884 = 119623^2 + 76122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20104221013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104221413) 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, 289438 + ... + 352111.

It is an arithmetic number, because the mean of its divisors is an integer number (5026223475).

Almost surely, 2^20104221013 is an apocalyptic number.

It is an amenable number.

20104221013 is a deficient number, since it is larger than the sum of its proper divisors (672887).

20104221013 is an equidigital number, since it uses as much as digits as its factorization.

20104221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672886.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20104221013 its reverse (31012240102), we get a palindrome (51116461115).

The spelling of 20104221013 in words is "twenty billion, one hundred four million, two hundred twenty-one thousand, thirteen".