21013020313 has 8 divisors (see below), whose sum is σ = 21506574848. Its totient is φ = 20519687664.

The previous prime is 21013020307. The next prime is 21013020337. The reversal of 21013020313 is 31302031012.

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 21013020313 - 2³³ = 12423085721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013020373) 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 7 ways as a sum of consecutive naturals, for example, 144520 + ... + 250822.

It is an arithmetic number, because the mean of its divisors is an integer number (2688321856).

Almost surely, 2^21013020313 is an apocalyptic number.

It is an amenable number.

21013020313 is a deficient number, since it is larger than the sum of its proper divisors (493554535).

21013020313 is a wasteful number, since it uses less digits than its factorization.

21013020313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110943.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21013020313 its reverse (31302031012), we get a palindrome (52315051325).

The spelling of 21013020313 in words is "twenty-one billion, thirteen million, twenty thousand, three hundred thirteen".