21301021013 has 4 divisors (see below), whose sum is σ = 21302319360. Its totient is φ = 21299722668.

The previous prime is 21301020971. The next prime is 21301021033. The reversal of 21301021013 is 31012010312.

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 21301021013 - 2¹² = 21301016917 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 (21301021033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624245 + ... + 657482.

It is an arithmetic number, because the mean of its divisors is an integer number (5325579840).

Almost surely, 2^21301021013 is an apocalyptic number.

It is an amenable number.

21301021013 is a deficient number, since it is larger than the sum of its proper divisors (1298347).

21301021013 is a wasteful number, since it uses less digits than its factorization.

21301021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298346.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21301021013 its reverse (31012010312), we get a palindrome (52313031325).

The spelling of 21301021013 in words is "twenty-one billion, three hundred one million, twenty-one thousand, thirteen".