21065011413 has 4 divisors (see below), whose sum is σ = 28086681888. Its totient is φ = 14043340940.

The previous prime is 21065011411. The next prime is 21065011427. The reversal of 21065011413 is 31411056012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21065011413 - 2¹ = 21065011411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21065011411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3510835233 + ... + 3510835238.

It is an arithmetic number, because the mean of its divisors is an integer number (7021670472).

Almost surely, 2^21065011413 is an apocalyptic number.

It is an amenable number.

21065011413 is a deficient number, since it is larger than the sum of its proper divisors (7021670475).

21065011413 is an equidigital number, since it uses as much as digits as its factorization.

21065011413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021670474.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21065011413 its reverse (31411056012), we get a palindrome (52476067425).

The spelling of 21065011413 in words is "twenty-one billion, sixty-five million, eleven thousand, four hundred thirteen".