21000311413 has 2 divisors, whose sum is σ = 21000311414. Its totient is φ = 21000311412.

The previous prime is 21000311407. The next prime is 21000311417. The reversal of 21000311413 is 31411300012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20202926769 + 797384644 = 142137^2 + 28238^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000311413 - 2⁹ = 21000310901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000311417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500155706 + 10500155707.

It is an arithmetic number, because the mean of its divisors is an integer number (10500155707).

Almost surely, 2^21000311413 is an apocalyptic number.

It is an amenable number.

21000311413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000311413 is an equidigital number, since it uses as much as digits as its factorization.

21000311413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21000311413 its reverse (31411300012), we get a palindrome (52411611425).

The spelling of 21000311413 in words is "twenty-one billion, three hundred eleven thousand, four hundred thirteen".