20210404013 has 2 divisors, whose sum is σ = 20210404014. Its totient is φ = 20210404012.

The previous prime is 20210404009. The next prime is 20210404073. The reversal of 20210404013 is 31040401202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14748159364 + 5462244649 = 121442^2 + 73907^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210404013 - 2² = 20210404009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210403982 and 20210404000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210404073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105202006 + 10105202007.

It is an arithmetic number, because the mean of its divisors is an integer number (10105202007).

Almost surely, 2^20210404013 is an apocalyptic number.

It is an amenable number.

20210404013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210404013 is an equidigital number, since it uses as much as digits as its factorization.

20210404013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20210404013 its reverse (31040401202), we get a palindrome (51250805215).

The spelling of 20210404013 in words is "twenty billion, two hundred ten million, four hundred four thousand, thirteen".