21011413 has 2 divisors, whose sum is σ = 21011414. Its totient is φ = 21011412.

The previous prime is 21011411. The next prime is 21011423. The reversal of 21011413 is 31411012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 2331729 = 4322^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011413 - 2¹ = 21011411 is a prime.

Together with 21011411, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21011393 and 21011402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505706 + 10505707.

It is an arithmetic number, because the mean of its divisors is an integer number (10505707).

Almost surely, 2^21011413 is an apocalyptic number.

It is an amenable number.

21011413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011413 is an equidigital number, since it uses as much as digits as its factorization.

21011413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21011413 is about 4583.8207862001. The cubic root of 21011413 is about 275.9423889065.

Adding to 21011413 its reverse (31411012), we get a palindrome (52422425).

The spelling of 21011413 in words is "twenty-one million, eleven thousand, four hundred thirteen".