21013313031421 has 8 divisors (see below), whose sum is σ = 22131048747200. Its totient is φ = 19896754502880.

The previous prime is 21013313031419. The next prime is 21013313031427. The reversal of 21013313031421 is 12413031331012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21013313031421 - 2¹ = 21013313031419 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 (21013313031427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294260160 + ... + 294331561.

It is an arithmetic number, because the mean of its divisors is an integer number (2766381093400).

Almost surely, 2^{21013313031421} is an apocalyptic number.

It is an amenable number.

21013313031421 is a deficient number, since it is larger than the sum of its proper divisors (1117735715779).

21013313031421 is a wasteful number, since it uses less digits than its factorization.

21013313031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588593619.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21013313031421 its reverse (12413031331012), we get a palindrome (33426344362433).

The spelling of 21013313031421 in words is "twenty-one trillion, thirteen billion, three hundred thirteen million, thirty-one thousand, four hundred twenty-one".